Freediving

{{short description|Underwater diving without breathing apparatus}} thumb|A freediver on the ocean floor

'''Freediving''', '''free-diving''', '''free diving''', '''breath-hold diving''', or '''skin diving''' is a mode of underwater diving that relies on breath-holding (apnea) until resurfacing rather than the use of breathing apparatus such as scuba gear. Besides the limit of breath-hold, immersion in water and exposure to high ambient pressure also have physiological effects that limit the depths and duration possible in freediving.

Examples of freediving activities are traditional fishing techniques, competitive and non-competitive freediving, competitive and non-competitive spearfishing and freediving photography, synchronised swimming, underwater football, underwater rugby, underwater hockey, underwater target shooting and snorkeling. There are also a range of '''competitive apnea''' disciplines; in which competitors attempt to attain great depths, times, or distances on a single breath.

Historically, the term ''free diving'' was also used to refer to scuba diving, due to the freedom of movement compared with surface supplied diving.<ref name="Rebikoff 1955" /><ref name="Owen 1955" /><ref name="Taillez et al 1957" />

==History== {{See also|Sponge diving|Pearl hunting}} [[File:Bern Cod.318, f.020v-de lapide acato(agate).jpg|thumb|9th century illustration of a pearl diver]]

In ancient times freediving without the aid of mechanical devices was the only possibility, with the exception of the occasional use of reeds and leather breathing bladders.<ref name="Desislava et al 1999" /> The divers faced the same problems as divers today, such as blacking out during a breath hold. Freediving was practiced in ancient cultures to gather food, harvest resources such as sponge and pearl, reclaim sunken valuables, and to help aid military campaigns.<ref name="Rodríguez-Álvarez" /> In Ancient Greece, both Plato and Homer mention the sponge as being used for bathing. The island of Kalymnos was a main centre of diving for sponges. By using weights (skandalopetra) of as much as {{convert|15|kg|lb}} to speed the descent, breath-holding divers would descend to depths up to {{convert|30|m|ft}} to collect sponges.<ref name="Hendrickse and Merks 2009" /> Harvesting of red coral was also done by divers.<ref name="researchgate_359108430"/>

The Mediterranean had large amounts of maritime trade. As a result of shipwrecks, particularly in the fierce winter storms, divers were often hired to salvage whatever they could from the seabed.<ref name="Galili and Rosen 2008" />

Divers were also used in warfare. Defenses against sea vessels were often created, such as underwater barricades, and hence divers were often used to scout out the seabed when ships were approaching an enemy harbor. If barricades were found, it was divers who were used to disassemble them, if possible.<ref name="Frost 1968" /> During the Peloponnesian War, divers were used to get past enemy blockades to relay messages as well as supplies to allies or troops that were cut off,<ref name="Thucydides" /> and in 332 BC, during the Siege of Tyre, the city used divers to cut the anchor cables of Alexander's attacking ships.<ref name="Arrian" />

In Japan, ''ama'' divers began to collect pearls about 2,000 years ago.<ref name="uhms1985" /><ref name="ama" /> For thousands of years, most seawater pearls were retrieved by divers working in the Indian Ocean, in areas such as the Persian Gulf, the Red Sea, and in the Gulf of Mannar (between Sri Lanka and India).<ref name="De Silva 1995" /> A fragment of Isidore of Charax's Parthian itinerary was preserved in Athenaeus's 3rd-century ''Sophists at Dinner'', recording freediving for pearls around an island in the Persian Gulf.<ref name="Isidore" />

Pearl divers near the Philippines were also successful at harvesting large pearls, especially in the Sulu Archipelago. At times, the largest pearls belonged by law to the sultan, and selling them could result in the death penalty for the seller. Nonetheless, many pearls made it out of the archipelago by stealth, ending up in the possession of the wealthiest families in Europe.<ref name="Sooloo archipelago" /> Pearling was popular in Qatar, Bahrain, Japan, and India. The Gulf of Mexico was also known for pearling.<ref name="UN News" /> Native Americans harvested freshwater pearls from lakes and rivers like the Ohio, Tennessee, and Mississippi, while others dived for marine pearls from the Caribbean and waters along the coasts of Central and South America.<ref name="Warsh 2010" />

In 1940, Dottie Frazier pioneered freediving for women in the United States and also began teaching classes. It was also during this time that she began to design and sell rubber suits for Navy UDT divers.<ref name="Russ" />

==Freediving activities==

=== Recreational hunting and gathering ===

====Spearfishing==== {{main|Spearfishing}} Spearfishing is an ancient method of fishing that has been used throughout the world for millennia. Early civilizations were familiar with the custom of spearing fish from rivers and streams using sharpened sticks.<ref name="ebsco" >{{cite web|url=https://www.ebsco.com/research-starters/sports-and-leisure/spearfishing |title=Spearfishing |last=Caffrey |first= Cait |website=www.ebsco.com |access-date=28 November 2025 }}</ref>

Modern spearfishing makes use of elastic powered spearguns and slings, or compressed gas pneumatic powered spearguns, to strike the hunted fish. Specialised techniques and equipment have been developed for various types of aquatic environments and target fish. Spearfishing may be done using free-diving, snorkelling, or scuba diving techniques. Spearfishing while using scuba equipment is illegal in some countries. The use of mechanically powered spearguns{{clarify|What is a mechanically powered speargun?|date=September 2022}} is also outlawed in some countries and jurisdictions.{{citation needed|date=October 2016}} Spearfishing is highly selective, normally uses no bait and has limited by-catch.<ref name="Smith and Nakaya 2002" />

====Collection of shellfish==== Various cultures have collected shellfish by freediving for "possibly thousands" of years.<ref name="Kruger 2023" /><ref name="Stratton 2019" /><ref name="Rincon 2018" /> One example is the historical recreational collection of abalone in South Africa, before illegal harvesting reduced stocks to levels which resulted in recreational collection being banned indefinitely. This did not completely stop illegal harvesting, because selling illegally harvested abalone remained lucrative.<ref name="deGreef2018" />

===Competitive breath-hold watersports===

====Aquathlon==== {{main|Aquathlon}} Aquathlon (also known as underwater wrestling) is an underwater sport where two competitors wearing masks and fins wrestle underwater in an attempt to remove a ribbon from each other's ankle band in order to win the bout. The "combat" takes place in a 5-metre (16 ft) square ring within a swimming pool, and is made up of three 30-second rounds, with a fourth round played in the event of a tie. The sport originated during the 1980s in the former USSR (now Russia) and was first played at international level in 1993. It was recognised by the {{Lang|fr|Confédération Mondiale des Activités Subaquatiques|italic=no}} (CMAS) in 2008.<ref name="Aquathlon History" /><ref name="Aquathlon" /><ref name="Ceduno 2009" /><ref name="CMAS Aquathlon" />

====Competitive spearfishing====

Competitive spearfishing is defined by the world governing body CMAS as "the hunting and capture of fish underwater without the aid of artificial breathing devices, using gear that depends entirely on the physical strength of the competitor." They publish a set of competition rules that are used by affiliated organisations.<ref name="CMAS Spearfishing" /><ref name="Spearfishing rules" />

====Synchronised swimming==== thumb|upright|A member of the Japanese team is thrown up in the air by other members under the water during the team's free routine at the 2013 French Open. {{main|Synchronised swimming}}

Synchronized swimming is a hybrid form of swimming, dance, and gymnastics, consisting of swimmers (either solos, duets, trios, combos, or teams) performing a synchronized routine of elaborate moves in the water, accompanied by music. Synchronized swimming demands advanced water skills, and requires great strength, endurance, flexibility, grace, artistry and precise timing, as well as exceptional breath control when upside down underwater. During lifts swimmers are not allowed to touch the bottom.<ref name="IWSFed" />

Traditionally it was a women's sport, but following the addition of a new mixed-pair event, FINA World Aquatics competitions are open to men since the 16th 2015 championships in Kazan, and the other international and national competitions allow male competitors in every event. However, men are currently still barred from competing in the Olympics. Both USA Synchro and Synchro Canada allow men to compete with women. Most European countries also allow men to compete, and France even allows male only podiums, according to the number of participants. In the past decade, more men are becoming involved in the sport and a global biannual competition called Men's Cup has been steadily growing.{{citation needed|date=October 2016}}

Swimmers perform two routines for the judges, one technical and one free, as well as age group routines and figures. Synchronized swimming is both an individual and team sport. Swimmers compete individually during figures, and then as a team during the routine. Figures are made up of a combination of skills and positions that often require control, strength, and flexibility. Swimmers are ranked individually for this part of the competition. The routine involves teamwork and synchronization. It is choreographed to music and often has a theme. Synchronized swimming is governed internationally by FINA (Fédération Internationale de Natation).{{cn|date=November 2025}}

====Underwater hockey==== thumb|Two players compete for the puck in underwater hockey. {{main|Underwater hockey}}

Underwater hockey (also called '''octopush''', mainly in the United Kingdom) is a globally played limited-contact sport in which two teams compete to manoeuvre a hockey puck across the bottom of a swimming pool into the opposing team's goal by propelling it with a hockey stick. The sport originated in England in 1954 when Alan Blake, the founder of the newly formed Southsea Sub-Aqua Club, invented the game he called octopush to keep the club's members interested and active during the cold winter months, when open-water diving is limited.<ref name="CMAS Hockey history" /> Underwater hockey is now played worldwide, governed by the {{Lang|fr|Confédération Mondiale des Activités Subaquatiques|italic=no}} (CMAS).<ref name="CMAS Hockey commission" /> The first Underwater Hockey World Championship was held in Canada in 1980, after a planned championship in 1979 was scuttled by international politics and apartheid.{{citation needed|date=October 2016}}

====Underwater football==== thumb|US Navy Students playing underwater football {{main|Underwater football}}

Underwater football is a two-team underwater sport that shares common elements with underwater hockey and underwater rugby. As with both of those games, it is played in a swimming pool with snorkeling equipment (mask, snorkel, and fins). The goal of the game is to manoeuvre (by carrying and passing) a slightly negatively buoyant ball from one side of a pool to the other by players who are completely submerged underwater. Scoring is achieved by placing the ball (under control) in the gutter on the side of the pool. Variations include using a toy rubber torpedo as the ball, and weighing down buckets to rest on the bottom and serve as goals.{{citation needed|date=October 2016}}

It is played in the Canadian provinces of Alberta, Manitoba, Newfoundland and Labrador, and Saskatchewan.<ref name="where played" />

====Underwater rugby==== {{main|Underwater rugby}}

Underwater rugby is an underwater team sport. During a match, two teams try to score a negatively buoyant ball (filled with saltwater) into the opponents' goal at the bottom of a swimming pool. It originated from within the physical fitness training regime existing in German diving clubs during the early 1960s and has little in common with rugby football except for the name. It was recognised by CMAS in 1978 and was first played as a world championship in 1980.{{citation needed|date=October 2016}}

====Underwater target shooting==== {{main|Underwater target shooting}}

Underwater target shooting is an underwater sport that tests a competitors' ability to accurately use a speargun via a set of individual and team events conducted in a swimming pool using free diving or apnea technique. The sport was developed in France during the early 1980s and is currently practised mainly in Europe. It is known as {{Lang|fr|Tir sur cible subaquatique}} in French and as {{Lang|es|Tiro al Blanco Subacuático}} in Spanish.

==Competitive apnea==

thumb|Monofin freediver Competitive freediving is currently governed by two world associations: AIDA International<ref name="RRR8947" /> and {{Lang|fr|Confédération Mondiale des Activités Subaquatiques|italic=no}} (CMAS). Historically, there were two more organisations that regulated freediving records and activities — International Association of Freedivers (IAFD) and Freediving Regulations and Education Entity (FREE).<ref name="Seanomad" /><ref name="apneablue" /> Each organization has its own rules on recognizing a record attempt which can be found on the organization's website. Alongside competitive disciplines, there are record disciplines — disciplines that are not held in competitions, that are just for setting world records. There is a third organization, Guinness, which in addition to AIDA and CMAS presides over record disciplines.{{citation needed|date=January 2018}}

Almost all types of competitive freediving are individual sports based on the best individual achievement. Exceptions to this rule are the bi-annual AIDA Team World Championship, where the combined score of the team members makes up the team's total points, and Skandalopetra diving competitions held by CMAS, the only truly 'team' event in freediving for which teams are formed by two athletes: one acting as the diver ({{Langx|el|βουτηχτής|translit=voutichtis|label=none}}) and the other acting as an assistant ({{Langx|el|κολαουζέρης|translit=kolaouzeris|label=none}}).{{cn|date=November 2025}}

=== Disciplines === There are currently eleven recognized disciplines defined by AIDA and CMAS, and a dozen more that are only practiced locally.{{clarify|reason=what are the dozen more?|date=December 2017}}{{citation needed|date=December 2017}} All disciplines can be practiced by both men and women, and only CMAS currently distinguishes records in fresh water from those at sea. The disciplines of AIDA can be done both in competition and as a record attempt, with the exception of variable weight and no limits, which are both solely for record attempts. For all AIDA depth disciplines, the depth the athlete will attempt is announced before the dive; this is accepted practice for both competition and record attempts. Most divers choose monofin (MF) over bifins (BF) where there is a choice.{{cn|date=November 2025}}

{| class="wikitable sortable" style="text-align:center" |- ! rowspan="2" | Discipline ! rowspan="2" | Measurement ! colspan="2" | AIDA<ref name="AIDA-disciplines" /> ! colspan="2" | CMAS<ref name="CMAS-disciplines" /> ! class="unsortable" rowspan="2" | Description |- ! open water ! pool ! open water ! pool |- | align="left" bgcolor="#f2f2f2" | '''Constant weight apnea''' ('''CWT''') || depth || {{aye}} || – || {{aye}} || – | align="left"| Maximum depth following a guide line. The line to act solely as a guide and only a single hold of the rope to stop the descent and start the ascent is permitted. Dropping dive weights is not permitted. Both bi-fins and monofin are permitted and the technique is irrelevant. |- | align="left" bgcolor="#f2f2f2" | '''Constant weight bi-fins''' ('''CWT BF''', '''CWTB''') || depth || {{aye}} || – || {{aye}} || – | align="left"| As for CWT above but monofins are not permitted and the athlete is prohibited to use a dolphin kick for his / her propulsion. |- | align="left" bgcolor="#f2f2f2" | '''Constant weight without fins''' ('''CNF''') || depth || {{aye}} || – || {{aye}} || – | align="left"| As for CWT above but no swimming aids such as fins are permitted. This discipline is the most recently recognised discipline having been recognised by AIDA since 2003. |- | align="left" bgcolor="#f2f2f2" | '''Dynamic apnea without fins''' ('''DNF''') || horizontal distance || – || {{aye}} || {{aye}} || {{aye}} | align="left"| Maximum distance underwater, in a pool, no swimming aids such as fins are permitted (AIDA). |- | align="left" bgcolor="#f2f2f2" | '''Dynamic apnea with fins''' ('''DYN''') || horizontal distance || – || {{aye}} || {{aye}} || {{aye}} | align="left"| Maximum horizontal distance on one breath in a pool. Monofin or bi-fins are permitted and the technique is irrelevant. |- | align="left" bgcolor="#f2f2f2" | '''Dynamic apnea with bifins''' ('''DYN BF''', '''DYNB''') || horizontal distance || – || {{aye}} || – || {{aye}} | align="left"| Same as DYN above but monofins are not permitted and the athlete is prohibited to use a dolphin kick for his / her propulsion. |- | align="left" bgcolor="#f2f2f2" | '''Free immersion apnea''' ('''FIM''') || depth || {{aye}} || – || {{aye}} || – | align="left"| Maximum depth following a vertical line. The line may be used to pull down to depth and back to the surface. No ballast or fins are permitted. It is known for its ease compared with the Constant Weight disciplines, while still not permitting the release of weights. |- | align="left" bgcolor="#f2f2f2" | '''Jump blue''' ('''JB''', also '''the cube''') || horizontal distance || colspan="2"|{{nay}} || {{aye}} || – | align="left"| Maximum distance covered around a 15-metre square at a depth of 10 metres. Monofin, bi-fins or no fins are all permitted. Sled may be used for descent. |- | align="left" bgcolor="#f2f2f2" | '''No-limits apnea''' ('''NLT''') || depth || {{aye}} || – || colspan="2"|{{nay}} | align="left"| Any means of breath-hold diving to depth and return to the surface is permitted provided that a guideline is used to measure the distance. Most divers use a weighted sled to descend and an inflatable bag to ascend. It is important to note that new attempts are not recognised due to the level of danger presented to divers<ref>{{Cite web |title=AIDA {{!}} Competitive |url=https://www.aidainternational.org/competitive |access-date=2025-05-17 |website=www.aidainternational.org}}</ref> |- | align="left" bgcolor="#f2f2f2" | '''Skandalopetra''' || depth & min. time || colspan="2"|{{nay}} || {{aye}} || – | align="left"| The only true team event in freediving. Diver 1 descends, usually assisted by a stone or marble slab attached to a rope, while Diver 2 waits on the surface. Diver 1 reaches the target depth and is hauled to the surface by Diver 2 using only muscle power. No diving mask, suit or fins are permitted, only nose clip. |- | align="left" bgcolor="#f2f2f2" | '''Static apnea''' ('''STA''') || max. time || {{aye}} || {{aye}} || {{aye}} || {{aye}} | align="left"| Timed breathhold endurance while floating on the surface or standing on the bottom. Usually in a pool. |- | align="left" bgcolor="#f2f2f2" | '''Static apnea with pure oxygen''' ('''STA O2''') || max. time || colspan="2"|{{nay}} || colspan="2"|{{nay}} | align="left"| Timed breathhold endurance, pre-breathing 100% oxygen for up to 30 minutes prior to the breathhold is permitted. Usually in a pool. Although no longer recognised by either AIDA or CMAS there were three instances of records being approved by AIDA. |- | align="left" bgcolor="#f2f2f2" | '''Speed-endurance apnea''' ('''S&E apnea''')<ref name="deeperblue.com" /> || min. time || colspan="2"|{{nay}} || – || {{aye}} | align="left"| Shortest time over a fixed, underwater distance. An endurance sub-discipline is swum in fractions of a pool length alternating apnoea swimming with passive recovery at the intervals. Disciplines are '''SPE''' – 100m speed apnoea, '''END 16x50''' – 800m and '''END 8x50''' – 400m endurance apnoea. |- | align="left" bgcolor="#f2f2f2" | '''Variable weight apnea without fins''' ('''VNF''') || depth || colspan="2"|{{nay}} || {{aye}} || – | align="left"| Descent is assisted by a weighted sled sliding down a line, the ascent may be by pulling up along the line or swimming without fins. |- | align="left" bgcolor="#f2f2f2" | '''Variable weight apnea''' ('''VWT''') || depth || {{aye}} || – || {{aye}} || – | align="left"| Descent is assisted by a weighted sled sliding down a line, the ascent may be either by: 1.) pulling up along the line or swimming with or without fins under AIDA rules 2.) swimming with fins under CMAS rules.

|} thumb|Herbert Nitsch, World Record Holder Freediver thumb|Deep-Sea World Cup Camotes Islands, Philippines; Constant Weight No-fins (CNF); Agata Załęcka 2025 ;Overview of the above disciplines<ref name="CMAS apnoea" /><ref name="freedive-earth" /><ref name="deeperblue.com" /> {| class=wikitable style="border:1px solid #AAAAAA" |- bgcolor="#EFEFEF" !colspan="1" rowspan="2"|Discipline !colspan="2"|Aids permitted !rowspan="1" rowspan="2"|Weight change permitted? |- !Descent !Ascent |- align="center" bgcolor="#FFFFFF" |'''CNF''' |None or weight |None |No |- align="center" bgcolor="#FFFFFF" |'''CWT''' |BF / MF and/or weight |BF / MF |No |- align="center" bgcolor="#FFFFFF" |'''CWT BF''' |BF and/or weight |BF |No |- align="center" bgcolor="#FFFFFF" |'''DNF''' | – | – | – |- align="center" bgcolor="#FFFFFF" |'''DYN''' | – | – | – |- align="center" bgcolor="#FFFFFF" |'''DYN BF''' | – | – | – |- align="center" bgcolor="#FFFFFF" |'''FIM''' |Rope or none |Rope or none |No |- align="center" bgcolor="#FFFFFF" |'''JB''' |Sled and/or BF / MF or none |BF / MF or none |Sled only |- align="center" bgcolor="#FFFFFF" |'''NLT (No Limit)''' (Only AIDA) |Any |Any |Yes |- align="center" bgcolor="#FFFFFF" |'''Skandalopetra''' |Stone |Hauled up |Yes |- align="center" bgcolor="#FFFFFF" |'''STA''' | – | – | – |- align="center" bgcolor="#FFFFFF" |'''STA O2''' | – | – | – |- align="center" bgcolor="#FFFFFF" |'''S&E Apnoea''' | – | – | – |- align="center" bgcolor="#FFFFFF" |'''VNF''' (only CMAS) |Sled |Rope or none |Yes |- align="center" bgcolor="#FFFFFF" |'''VWT''' |Sled |BF / MF or rope |Yes |}

===World records=== The best official result in static apnea is the Guinness WR of 11:54 by Branko Petrović in 2014, a freediver who has results over 10 minutes under both AIDA and CMAS.{{cn|date=November 2025}} The best no limits result is 253.2m by Herbert Nitsch in 2012; his intention of having the dive sanctioned by AIDA fell through due to a sponsoring conflict.{{cn|date=November 2025}} After 2001, AIDA International no longer separated the records achieved in fresh water from those in the sea.{{cn|date=November 2025}}

====CMAS recognized world records==== {{As of|2024|01|01}}, the CMAS recognized world records are:<ref name="CMAS-WR" /> {|class="wikitable sortable" style="font-size: 95%;" |+ ! colspan="2" |Discipline !Gender !Depth [m] !Distance [m] !Time !Name/Country !Date !Place |- | rowspan="2" | Static apnea || rowspan="2" | STA|| bgcolor="#c2ebf5" |Men||–||–||10:45.000||{{flagathlete|Branko Petrović|SRB}}||2017-11-11||Subotica, Serbia |- | bgcolor="#fde9d9" |Women||–||–||08:53.150||{{flagathlete|Veronika Dittes|AUT}}||2017-06-15||Cagliari, Italy |- | rowspan="6" | Dynamic apnea with fin || rowspan="2" | DYN || bgcolor="#c2ebf5" |Men||–||321.43||–||{{flagathlete|Mateusz Malina|POL}}||2022-06-15||Belgrade, Serbia |- | bgcolor="#fde9d9" |Women||–||275.36||–||{{flagathlete|Mirela Kardašević|CRO}}||2022-06-15||Belgrade, Serbia |- | rowspan="2" | under ice|| bgcolor="#c2ebf5" | Men ||–||175||–||{{flagathlete|Arthur Guérin-Boëri|FRA}}||{{nowrap|2017-03-11}}||Lake Sonnanen, Finland |- | bgcolor="#fde9d9" |Women||–||140||–||{{flagathlete|Valentina Cafolla|CRO}}||{{nowrap|2024-02-23}}||Lake Anterselva, Italy<ref name="Valentina Cafolla smashes under-ice freediving record" /> |- | rowspan="2" | open water || bgcolor="#c2ebf5" |Men||–||200||–||{{flagathlete|Sertan Aydin|TUR}} || || |- | bgcolor="#fde9d9" |Women||–||||–|||||| |- |rowspan="2" | Dynamic apnea with bifins || rowspan="2" | DBF || bgcolor="#c2ebf5" |Men||–||274.70||–||{{flagathlete|Guillaume Bourdila|FRA}}||2022-06-13||Belgrade, Serbia |- | bgcolor="#fde9d9" |Women||–||250.00||–||{{flagathlete|Mirela Kardašević|CRO}}||2022-06-13||Belgrade, Serbia |- | rowspan="4" | Dynamic apnea without fins || rowspan="2" | DNF-50|| bgcolor="#c2ebf5" |Men||–||236||–||{{flagathlete|Guillaume Bourdila|FRA}}||2019-06-19||Istanbul, Turkey |- | bgcolor="#fde9d9" |Women||–||210||–||{{flagathlete|Julia Kozerska|POL}}||2022-06-12||Belgrade, Serbia |- | rowspan="2" | DNF-25 || bgcolor="#c2ebf5" |Men||–||220.70||–||{{flagathlete|Vanja Peles|CRO}}||2021-03-28||Sisak, Croatia |- | bgcolor="#fde9d9" |Women||–||206.20||–||{{flagathlete|Mirela Kardasevic|CRO}}||2021-03-28||Sisak, Croatia |- | rowspan="2" | Speed 100 m. || rowspan="2" | SPE ||bgcolor="#c2ebf5" |Men||–||–||00:30.350||{{flagathlete|Malte Striegler|GER}}||2018-06-15||Lignano, Italy |- | bgcolor="#fde9d9" |Women||–||–||00:35.860||{{flagathlete|Vera Yarovitskaya|RUS}}||2017-06-15||Cagliari, Italy |- | rowspan="6" | Endurance || rowspan="2" |END16x50|| bgcolor="#c2ebf5" |Men||–||–||09:10.030||{{flagathlete|Max Poschart|GER}}||2019-06-19||Istanbul, Turkey |- | bgcolor="#fde9d9" |Women||–||–||10:41.120||{{flagathlete|Evgeniia Kozyreva|RUS}}||2021-06-23||Belgrade, Serbia |- | rowspan="2" | END8x50 ||bgcolor="#c2ebf5" |Men||–||–||03:05.720||{{flagathlete|Mikhail Drozdov|RUS}}||2019-06-22||Istanbul, Turkey |- | bgcolor="#fde9d9" |Women||–||–||04:10.190||{{flagathlete|Chiara Zaffaroni|ITA}}||{{nowrap|2023-05-10}}||Kuwait |- | rowspan="2" | END4x50 || bgcolor="#c2ebf5" |Men||–||–|| || || || |- | bgcolor="#fde9d9" |Women||–||–||01:33.860||{{flagathlete|Chiara Zaffaroni|ITA}}||{{nowrap|2023-05-11}}||Kuwait |- | rowspan="4" | Jump blue apnea with fins || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||–||201.61||–||{{flagathlete|Arthur Guérin-Boëri|FRA}}||2015-10-09||Ischia, Italy |- | bgcolor="#fde9d9" |Women||–||190.48||–||{{flagathlete|Alessia Zecchini|ITA}}||2015-10-09||Ischia, Italy |- | rowspan="2" | {{nowrap|fresh water}}|| bgcolor="#c2ebf5" |Men||–||170||–||{{flagathlete|Alfredo Leonidas Rosado Estrada|ECU}}|| || |- | bgcolor="#fde9d9" |Women||–||132.92||–||{{flagathlete|Gilda Rivadeneria Montalvo|ECU}}|| || |- | rowspan="4" | Constant weight with fins || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||136||–||–||{{flagathlete|Alexey Molchanov|RUS}}||2023-08-23 || Roatan, Honduras |- | bgcolor="#fde9d9" |Women||122||–||–||{{flagathlete|Alenka Artnik|SLO}}|| 2021-07-21 || Long Island, Bahamas |- | rowspan="2" | fresh water || bgcolor="#c2ebf5" |Men||80||–||–||{{flagathlete|Michele Tomasi|ITA}}|| || |- | bgcolor="#fde9d9" |Women||57||–||–||{{flagathlete|Tanya Streeter|UK|USA}}||1998-12-28||Ocala, Fl, USA |- | rowspan="4" | Constant weight with bifins (CWT BF) || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||124 ||–||–||{{flagathlete|Alexey Molchanov|RUS}} ||2023-08-25||Roatan, Honduras |- | bgcolor="#fde9d9" |Women||106||–||–||{{flagathlete|Alenka Artnik|SLO}}||2021-09-30||Kaş, Turkey |- | rowspan="2" | fresh water || bgcolor="#c2ebf5" |Men||75||–||–||{{flagathlete|Michele Tomasi|ITA}}|| || |- | bgcolor="#fde9d9" |Women||||–||–|||||| |- | rowspan="4" | Constant weight without fins || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||100||–||–||{{flagathlete|Alexey Molchanov|RUS}}||2023-08-23||Roatan, Honduras |- | bgcolor="#fde9d9" |Women||78||–||–||{{flagathlete|Kateryna Sadurska|UKR}}||2023-08-24||Roatan, Honduras |- | rowspan="2" | fresh water || bgcolor="#c2ebf5" |Men||65||–||–||{{flagathlete|Michal Rišian|CZE}}||2016-07-10||Weyregg, Austria |- | bgcolor="#fde9d9" |Women||–||–||–||–||–||– |- | rowspan="2" | Free immersion apnea || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||132||–||–||{{flagathlete|Petar Klovar|CRO}}||2022-10-04||Kaş, Turkey |- | bgcolor="#fde9d9" |Women||72||–||–||{{flagathlete|Alessia Zecchini|ITA}}||2021-07-17||Long Island, Bahamas |- | rowspan="2" | Variable weight apnea monofin || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||131||–||–||{{flagathlete|Homer Leuci|ITA}}||2012-09-11||Soverato, Italy |- | bgcolor="#fde9d9" |Women||116||–||–||{{flagathlete|Lena Balta|SER}} || 2022-06-25||Sharm el Sheik, Egypt |- | rowspan="2" | Variable weight apnea bifins || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||130||–||–||{{flagathlete|William Winram|SWI}}||2021-10-21||Sharm el Sheik, Egypt |- | bgcolor="#fde9d9" |Women||-||–||–|| || || |- | rowspan="2" | Variable weight apnea without fins (VNF) || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||140||–||–||{{flagathlete|William Winram|SWI}}||2023-12-11 ||Sharm el Sheik, Egypt |- | bgcolor="#fde9d9" |Women||106||–||–||{{flagathlete|Şahika Ercümen|TUR}}||2023-10-17 ||Hatay, Turkey |- | rowspan="2" | Skandalopetra || rowspan="2" | at sea || bgcolor="#c2ebf5" |Men||112||–||–||{{flagathlete|Andreas Güldner|GER}}||2014-06-26||Red Sea, Egypt |- | bgcolor="#fde9d9" |Women||68.9||–||–||{{flagathlete|Karol Meyer|BRA}}||2012||Bonaire, Caribbean |}

====AIDA recognized world records==== {{As of|2023|07|26}}, the AIDA recognized world records are:<ref name="AIDA-WR" /><ref name="worldrecords-AIDA" /><ref name="Vertical blue" /> {|class="wikitable sortable" style="font-size: 95%;" !Discipline !Gender !Depth [m] !Distance [m] !Time !Name !Date !Place |- |rowspan="2"|Static apnea (STA) || bgcolor="#c2ebf5" |Men||–||–||11 min 35 sec||{{Flagathlete|Stéphane Mifsud|FRA}}||{{Str trim|2009-06-08}}||Hyères, Var, France |- | bgcolor="#fde9d9" |Women||–||–||9 min 22 sec||{{Flagathlete|Heike Schwerdtner|GER}}||{{Str trim|2025-05-04}}||Stockholm, Sweden |- |rowspan="2"|Dynamic apnea with fins (DYN)|| bgcolor="#c2ebf5" |Men||–||316.53||–||{{Flagathlete|Mateusz Malina|POL}}<ref name="Klugstedt" />||{{Str trim|2019-06-22}}||Turku, Finland |- | bgcolor="#fde9d9" |Women||–||280||–||{{Flagathlete|Zsófia Törőcsik|HUN}}||{{Str trim|2025-07-02}}||Wakayama, Japan |- |rowspan="2"|Dynamic apnea with bifins (DYNB)|| bgcolor="#c2ebf5" |Men||–||298||–||{{Flagathlete|Guillaume Bourdila|FRA}}||{{Str trim|2025-06-28}}||Wakayama, Japan |- | bgcolor="#fde9d9" |Women||–||208||–||{{Flagathlete|Kardasevic Mirela|CRO}}||{{Str trim|2019-03-07}}||Moscow, Russia |- |rowspan="2"|Dynamic apnea without fins (DNF)|| bgcolor="#c2ebf5" |Men||–||250||–||{{Flagathlete|Mateusz Malina|POL}}||{{Str trim|2022-05-01}}||Dębica, Poland |- | bgcolor="#fde9d9" |Women||–||213||–||{{Flagathlete|Julia Kozerska|POL}}||{{Str trim|2023-06-13}}||Seogwipo, South Korea |- |rowspan="2"|Constant weight apnea (CWT)|| bgcolor="#c2ebf5" |Men||133||–||–||{{Flagathlete|Alexey Molchanov|RUS}}||{{Str trim|2023-07-22}}||Dean's Blue Hole, Long Island Bahamas |- | bgcolor="#fde9d9" |Women||123||–||–||{{Flagathlete|Alessia Zecchini|ITA}}||{{Str trim|2023-04-24}}||Camotes Island, Philippines |- |rowspan="2"|Constant weight apnea with bifins (CWTB)|| bgcolor="#c2ebf5" |Men||126||–||–||{{Flagathlete|Alexey Molchanov|RUS}}||{{Str trim|2025-09-26}}||Limassol, Cyprus |- | bgcolor="#fde9d9" |Women||111||–||–||{{Flagathlete|Alenka Artnik|SVN}}||{{Str trim|2023-07-30}}||Dean's Blue Hole, Long Island Bahamas |- |rowspan="2"|Constant weight apnea without fins (CNF)|| bgcolor="#c2ebf5" |Men||103||–||–||{{Flagathlete|Petar Klovar|CRO}}||{{Str trim|2025-05-26 }}||Sharm el-Sheikh, Egypt |- | bgcolor="#fde9d9" |Women||73||–||–||{{Flagathlete|Alessia Zecchini|ITA}}||{{Str trim|2016-04-26}}||Dean's Blue Hole, Long Island Bahamas |- |rowspan="2"|Free immersion apnea (FIM)|| bgcolor="#c2ebf5" |Men||133||–||–||{{Flagathlete|Alexey Molchanov|RUS}}||{{Str trim|2023-07-21}}||Dean's Blue Hole, Long Island Bahamas |- | bgcolor="#fde9d9" |Women||103||–||–||{{Flagathlete|Sanda Delija|HRV}}||{{Str trim|2025-05-04}}||Mabini, Philippines |- |rowspan="2"|Variable weight apnea (VWT)|| bgcolor="#c2ebf5" |Men||156||–||–||{{Flagathlete|Alexey Molchanov|RUS}}||{{Str trim|2023-03-28}}||Bonaire, Caribbean |- | bgcolor="#fde9d9" |Women||130||–||–||{{Flagathlete|Nanja van den Broek|NED}}||{{Str trim|2015-10-18}}||Sharm el-Sheikh, Egypt |- |rowspan="2"|No Limit apnea (NLT)|| bgcolor="#c2ebf5" |Men||214||–||–||{{Flagathlete|Herbert Nitsch|AUT}}||{{Str trim|2012-06-06}}||Santorini, Greece |- | bgcolor="#fde9d9" |Women||160||–||–||{{Flagathlete|Tanya Streeter|UK|USA}}||{{Str trim|2002-08-17}}||Turks and Caicos |} {|class="wikitable sortable" style="font-size: 95%;" !Discipline !Gender !Points !Team / Individual !Date !Place |- |rowspan="4"|AIDA team ||bgcolor="#c2ebf5" |Men ||840.6 ||align="center"|{{flag|CRO}} Goran Čolak, Božidar Petani, Veljano Zanki ||2012-09-16 ||Nice, France<ref name="AIDA results 2012" /><ref name="AIDA results men" /> |- |bgcolor="#fde9d9" |Women || ||align="center"| || || |- |bgcolor="#c2ebf5" |Men ||313.3 ||align="center"|{{Flagathlete|William Trubridge|NZL}} ||2010-07-06 ||Okinawa, Japan<ref name="trademe" /><ref name="AIDA event"/> |- |bgcolor="#fde9d9" |Women || ||align="center"| || || |- |}

====Guinness recognized world records==== The following table only includes those disciplines that are modifications of existing AIDA or CMAS disciplines and Guinness-exclusive (as it recognizes and inherits some AIDA/CMAS records) or Guinness-conceived (CMAS and AIDA do/did sanction at some time{{clarify|date=November 2025}}) disciplines.

{{As of|2018|02|25}}: {|class="wikitable sortable" style="font-size: 95%;" !Discipline !Gender !Depth [m] !Distance [m] !Time !Name !Date !Place |- |rowspan="2"|STA O2|| bgcolor="#c2ebf5"|Men ||– ||– ||24:11 ||{{Flagathlete|Budimir Šobat|CRO}} ||24 February 2018 ||Zagreb |- | bgcolor="#fde9d9"|Women ||– ||– ||18:32 ||{{Flagathlete|Karol Meyer|BRA}} ||10 July 2009 ||Florianopolis |- |rowspan="2"|DYN under ice|| bgcolor="#c2ebf5"|Men ||– ||175 ||– ||colspan="3" rowspan="2"|''details under CMAS world records'' |- | bgcolor="#fde9d9"|Women ||– ||125 ||– |- |rowspan="2"|DNF under ice|| bgcolor="#c2ebf5"|Men ||– ||84 ||– ||{{Flagathlete|Nik Linder|GER}} ||Feb 2013 ||Weissensee<ref name="bonex-systeme.de" /><ref name="free-diving.de" /> |- | bgcolor="#fde9d9"|Women ||– || ||– || || || |- |rowspan="2"|DNF under ice (no diving suit)|| bgcolor="#c2ebf5"|Men ||– ||81 ||– ||{{Flagathlete|David Vencl|CZ}} ||Feb 2021 ||Lahošť lake |- | bgcolor="#fde9d9"|Women ||– ||50 ||– ||{{Flagathlete|Johanna Nordblad|FIN}} ||Mar 2015 ||Päijänne<ref name="freedive-earth ice" /> |- |rowspan="2"|NLT under ice|| bgcolor="#c2ebf5"|Men ||65 ||– ||– ||{{Flagathlete|Andreas Pap|SRB}} ||Feb 2013 ||Weissensee<ref name="bonex-systeme.de" /> |- | bgcolor="#fde9d9"|Women || ||– ||– || || || |}

==Recreational== [[File:Free divers at the Blue Hole 2.jpg|thumb|Recreational freediving at the Blue Hole in the Red Sea]]  Freediving as a recreational activity is widely practiced and differs significantly from scuba diving. Although there are risks to all freediving activities, it can be acceptably safely practiced at a wide range of skill levels from the average snorkeler to the professional freediver. Compared to scuba diving, freediving offers:{{citation needed|date=September 2016}}

* Freedom from cumbersome equipment and short preparation times. * Low cost. * It is quiet and does not disturb fish, the noise of breathing and bubbles can be quite loud on open circuit scuba though rebreathers are much quieter. * Mobility and speed, but for a much more limited period. * No decompression stops required for deep dives, although it is possible to get decompression sickness, or taravana, from repetitive deep free-diving with short surface intervals.<ref name="Wong 1999" /> This is balanced against much shorter dive times. * The lack of exhaled air bubbles gives better visibility during ascent. * Accessibility, if the site can be walked to it can, potentially, be dived.{{clarify|how does this differ from scubs?|date=November 2025}} * Appropriately skilled and fit freedivers can go as deep, or deeper than, recreational scuba divers, the depth being limited only by the willingness to accept the risks; scuba diving is restricted by the level of certification.{{dubious|date=November 2025}}{{relevance|date=November 2025}}

Freshwater springs and other caves, often with excellent visibility, have been freedived but with greater risks. Diving into water with restricted access to the surface is very different from diving in open water. The time available to a freediver to solve problems underwater before hypoxia sets in is severely restricted in comparison with scuba, and scuba diving under an overhead is not recommended without an independent emergency gas supply. Freediving into confined cave systems has resulted in several deaths.{{cn|date=November 2025}} Cave freediving is strongly discouraged in basic freediver safety training.<ref name="Kemna" >{{cite web |url=https://oceanographicmagazine.com/features/freediving-in-caves-an-interview-with-jesper-stechmann/ |title=Journey to the centre of the earth |first1=Lena |last1=Kemna |first2=Jesper |last2=Stechmann |website=oceanographicmagazine.com |access-date=28 November 2025 }}</ref>

==Physiology== {{see also|Human physiology of underwater diving}}

Human physiology of freediving is the physiological influences of the underwater environment on the human breath hold ambient pressure diver, and adaptations to operating underwater. It, therefore, includes the range of physiological effects generally limited to human freediving. Several factors influence the diver, including immersion, exposure to the water, the limitations of breath-hold endurance, variations in ambient pressure, and sensory impairment. All of these may affect diver performance and safety.<ref name="usn" />

Immersion affects fluid balance, circulation and work of breathing.<ref name="Pendergast and Lundgren 2009" /><ref name="Kollias et al 1976" /> Exposure to cold water can result in the harmful cold shock response,<ref name="phases" /><ref name="coldii" /> the helpful diving reflex and excessive loss of body heat.<ref name="Physiology and Pathophysiology" /><ref name="Panneton 2013" /><ref name="sterba" /><ref name="cheung" /> Breath-hold duration is limited by oxygen reserves, the response to raised carbon dioxide levels, and the risk of hypoxic blackout, which has a high associated risk of drowning.<ref name="Pearn et al 2015" /><ref name="shallow1968" /><ref name="dan" />

Large or sudden changes in ambient pressure have the potential for injury known as barotrauma.<ref name="usn" /><ref name="Brubakk" /> Metabolically inactive gases are absorbed by the tissues and may have narcotic or other undesirable effects, and must be released slowly to avoid the formation of bubbles during decompression.<ref name="Bauer1970" />

The underwater environment also affects sensory input, which can impact on safety and the ability to function effectively at depth.<ref name="Pendergast and Lundgren 2009" />

=== Recent human adaptation === In addition to general adaptations within the human species, freediving is an example of an activity that has been directly affected by recent human evolution. The Bajau, or "Sea Nomads," have engaged in freediving for thousands of years, and natural selection has led to larger spleen sizes. This serves as an oxygen reservoir when diving. It is hypothesized that other isolated diving populations globally may have experienced the same selection.<ref name="Ilardo 2018" />

==Techniques== {{see also|Skandalopetra diving}} Breath-holding ability, and hence dive performance, is a function of on-board oxygen stores, scope for metabolic rate reduction, efficient oxygen utilization, and hypoxia tolerance.<ref name="pmid22753202" /> Athletes attempt to accomplish this in various ways. Some divers use "packing", which increases lung volume beyond normal total lung capacity.<ref name="RRR10026" /> In addition, training is allocated to enhance blood and muscle oxygen stores, to a limited extent.{{clarify|date=May 2017}} Most divers rely on increasing fitness by increasing {{CO2}} tolerance and lung capacity. Simple breath-holding practice is highly effective for the build-up of tolerance to CO2 and to some degree increased lung capacity. In an interview on the radio talk show Fresh Air, journalist James Nestor, author of the book ''Breath: The New Science of a Lost Art'',<ref name="Nestor 2020" /> stated: "Some divers have a lung capacity of 14 liters, which is about double the size for a typical adult male. They weren't born this way. ... They trained themselves to breathe in ways to profoundly affect their physical bodies."<ref name="Gross" />{{dubious|date=November 2025}}

Before competition attempts, freedivers perform a preparation sequence, which usually consists of physical stretching, mental exercise and breath exercise. It may include a succession of variable length static apnea and special purging deep breaths. Results of the preparation sequence are slower metabolism, lower heart and breathing rates, lower levels of carbon dioxide in the bloodstream,<ref name="aaus1997" /> and overall mental equilibrium.{{citation needed|date=August 2017}}

===Lung packing=== Technically known as {{diving term|glossopharyngeal insufflation}}, lung packing or buccal pumping is a technique for inflating the lungs beyond their normal isobaric total capacity, which is used to delay the compression of the lungs at by hydrostatic pressure, allowing a greater depth to be reached, and provide a slightly larger reserve of oxygen for the dive. After full normal inspiration, the diver fills the mouth with air, with the glottis closed, then opens the glottis and forces the air from the mouth into the lung, then closes the glottis to hold in the air. This is repeated several times. Lung packing can increase the volume of air in the lungs by up to 50% of vital capacity. The pressure induced will reduce the volume of blood in the chest, which will increase the space available for air. The gas in the lungs is also compressed. Pressures of about {{convert|75|mmHg|mbar}} have been reported.<ref name="Lindholm 2006b" /> Lung packing has been associated with short-term haemodynamic instabilities, which might contribute toward triggering blackout.<ref name="Potkin et al 2007" />

===Recovery breathing=== Also known as hook breathing. This is a technique used by free divers on surfacing to reduce the risk of surface blackout. A partial exhalation is made, followed by a quick inhalation; then the diver closes the airway and pressurises for a few seconds as if about to cough. This behavior is repeated a few times over the first 30 seconds or so on the surface. The aim is to keep thoracic pressure slightly raised to artificially raise arterial oxygen partial pressure or prevent it from dropping in the critical seconds until newly oxygenated blood can reach the brain and thereby prevent surface blackout. This is the same technique used by pilots during high-g maneuvers, as well as by mountaineers at high altitude.<ref name="Krack et al 2006" /><ref name="Soltis" />

==Training== {{see also|Diver training#Freediving}}

There is no requirement by law that free-divers are required to do formal freediving training or be certified, but due to the risks inherent to the sport, freediving without knowledge or training can pose a greater risk to life. The free-diving courses contain three components: theory studies, confined water sessions generally conducted in a swimming pool, and open water sessions in the ocean or other large body of fresh or salt water.<ref name="Adreno" /><ref name="PADI certification" />

Training for breathhold endurance can take many forms, some of which can be performed on land. One training exercise is the apnea walk. This consists of a preparation "breathe-up", followed by a short (typically 1 minute) breath hold taken at rest. Without breaking the hold, participants then begin walking as far as possible until it becomes necessary to breathe again. Some athletes can do close to 400 meters in training this way.{{citation needed|date=September 2014}}

This form of training is good for accustoming muscles to work under anaerobic conditions, and for tolerance to carbon dioxide build-up in the circulation. It is also easy to gauge progress, as increasing distance can be measured.{{citation needed|date=May 2017}}

{{expand section|What is typical content of training program?|date=January 2025}}

=== Certification === There are several training agencies that provide certification in freediving at various levels from beginner to instructor. Some, like AIDA and Molchanovs, are focused exclusively on freediving, particularly competitive aspects, while others, like PADI and SSI, are primarily international recreational scuba training agencies that have branched out into recreational freediving. All of these agencies will provide instruction and practical training in aspects of safety, basic freediving physiology theory and practical techniques.<ref name="certificaion" >{{cite web |url=https://www.bluecornerfreedive.com/blog/comparing-freediving-certification-agencies-aida-padi-molchanovs-and-ssi |title=Comparing Freediving Certification Agencies: AIDA, PADI, Molchanovs, and SSI |date=24 May 2023 |website=www.bluecornerfreedive.com/ |access-date=27 November 2025 }}</ref>

==Safety== {{see also|Diving safety#Freediving safety|Buddy diving#Freediving procedures}} Freedivers are encouraged by certification and sporting organisations to dive only with a 'buddy' who accompanies them, observing from in the water at the surface, and ready to dive to the rescue if the diver loses consciousness during the ascent. This is only reasonably practicable if the water clarity allows observation, and the buddy is capable of safely reaching the diver. In poor visibility the diver can clip onto the downline with a buddy line. Signals can be transmitted on the downline and it can be used to find the diver. Spearfishers can use a surface marker buoy for the same purpose. Due to the nature of the sport, the risks of freediving can be reduced by strict adherence to safety measures as an integral part of the activity, but cannot be eliminated. Competition rules may require all participants to be certified and adept in rescue and resuscitation.<ref name="Chimiak and Valdivia-Valdivia 2024" /><ref name="Yiafas" />

===Hazards, consequences and risk=== {{see also|Diving hazards#The diving environment|Diving hazards#Hazards inherent in the diver|Freediving blackout|Drowning}} The most obvious hazard is lack of access to air for breathing – a necessity for human life. This can result in asphyxia from drowning if the diver does not reach the surface while still capable of holding their breath and resuming breathing. The risk depends on several factors, including the depth, duration and shape of the dive profile.<ref name="Mulder et al 2023" />

Latent hypoxia is a specific hazard of deeper freedives. This effect can cause hypoxic blackout during surfacing.<ref name="Lindholm Pollock and Lundgren 2006"/>

Freediving blackout, breath-hold blackout,<ref name="Boyd et al 2015"/> or apnea blackout is a class of hypoxic blackout, a loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold (freedive or dynamic apnea) dive, when the swimmer does not necessarily experience an urgent need to breathe and has no other obvious medical condition that might have caused it. It can be provoked by hyperventilating just before a dive, or as a consequence of the pressure reduction on ascent, or a combination of these. Victims are often established practitioners of breath-hold diving, are fit, strong swimmers and have not experienced problems before.<ref name=Brubakk /><ref name=dan /><ref name=shallow1968 />

Divers and swimmers who black out or grey out underwater during a dive will usually drown unless rescued and resuscitated within a short time.<ref name="Lane 2017" /> Freediving blackout has a high fatality rate, and mostly involves males younger than 40 years, but is generally avoidable. Risk cannot be quantified, but is clearly increased by any level of hyperventilation.<ref name="Pearn et al 2015" />

Freediving blackout can occur on any dive profile: at constant depth, on an ascent from depth, or at the surface following ascent from depth and may be described by a number of terms depending on the dive profile and depth at which consciousness is lost. Blackout during a shallow dive differs from blackout during ascent from a deep dive in that blackout during ascent is precipitated by depressurisation on ascent from depth while blackout in consistently shallow water is a consequence of hypocapnia following hyperventilation.<ref name=shallow1968 /><ref name=deep1996 />

There is also a wide range of environmental hazards possible specific to the site and water and weather conditions at the time of diving, and there may be other hazards specific to the freediving activity, such as spearfishing.<ref name="adreno" />

Failing to respond to physiological warning signals, or crossing the mental barrier by strong will, may lead to blackout underwater or on reaching the surface.<ref name="uhms1985" /><ref name="danworkshop" /> Trained freedivers are well aware of this and competitions must be held under strict supervision and with competent first-aiders on standby.<ref name="pmid16602257" /> However, this does not eliminate the risk of blackout.<ref name="Chimiak and Valdivia-Valdivia 2024" />

===Competition safety=== Following the deaths of two freedivers in competitions, AIDA has a system set up for monitoring and if necessary, recovering competitors who lose consciousness underwater. As of 2022 the incidence of adverse events in depth competitions varies between 3 and 4% of competition dives. This rate is considered relatively low and is expected during competitions where divers push their breath-hold limits. Almost all of these divers are successfully assisted and recover completely. There is a much lower incidence of more serious injuries.<ref name="Melikhov 2022" />

====Safety divers==== thumb|Deep safety principles for freediving with counter weight The safety team is usually made up of volunteers, or paid staff in some major events, and is supervised by the {{visible anchor|Chief of Safety}}. Each competitor is monitored by a team of breath-hold safety divers who will descend in time to meet the competitor during their ascent, and monitor them for the rest of the ascent. They will intervene if necessary, typically by securing the competitor's airway and swimming them up to the surface. The first safety diver will meet the competitor at somewhere around 1/3 to 1/4 of the target depth, usually with a maximum of 30m. The second will meet them about 10m shallower, and a third will be on standby in case of an emergency. The work can be challenging as many dives are done in a day, so the team of safety divers is usually rotated to ensure that they are not overtasked.<ref name="Melikhov 2022" /> Scuba divers and scooter freedivers may also be part of the safety team.<ref name="Bustad 2019" >{{cite web |url=https://www.dansa.org/blog/2019/06/12/freediving-safety |title=Freediving Safety |first=Chris |last=Bustad |date=12 June 2019 |website=www.dansa.org |access-date=28 November 2025 }}</ref>

In case of a deeper incident, the competitor is clipped to the downline for the duration of the dive, which can be rapidly raised by the surface support team, which includes a medical support group.<ref name="Melikhov 2022" />

===Statistics and notable accidents===  Nicholas Mevoli, a diver from New York died on 17 November 2013 after losing consciousness on surfacing from a 3-minute 38 second dive to a depth of {{convert|72|metres}} during an official record attempt in the "constant weight without fins" event. He had previously reached greater depths and longer times in other disciplines.<ref name="NYT" />

On 22 July 2017, Irish safety diver Stephen Keenan died during a dive in Dahab, Egypt. He was the safety diver for Italian freediver Alessia Zecchini, who was attempting to swim through the Arch of the Blue Hole (Red Sea). For reasons that remain unclear, Keenan began his descent approximately 20 seconds later than planned, causing him to miss the scheduled meeting point with Zecchini. He eventually reached her and assisted her ascent to the surface. Shortly afterward, Keenan lost consciousness and was later found floating face down in the water.<ref name="Keenan" />

==Fiction and documentaries==

===Documentaries=== *''Ocean Men'' (2001) is a documentary film about the art and science of freediving, featuring two of its most outstanding exponents: Francisco "Pipín" Ferreras and Umberto Pelizzari.<ref name="Ocean Men" /> *''My Pilot, Whale'' (2014) is a short documentary film directed by Alexander and Nicole Gratovsky, demonstrating direct communication between a human and free pilot whales in the open ocean. The entire underwater part was shot without underwater breathing equipment; both the operator and the person appearing in the frame are freediving.<ref name="youtube full" /> *''My Octopus Teacher'' (2020) is a nature documentary. Filmmaker Craig Foster captured most of the footage used in the film while freediving. *''The Deepest Breath'' (2023) is a feature-length documentary written and directed by Laura McGann about Italian freediver Alessia Zecchini and Irish safety diver Stephen Keenan.

===Fiction=== *In the film ''Mission: Impossible – Rogue Nation'', Tom Cruise plays super spy Ethan Hunt fighting the forces of evil, and goes freediving in a scene to expose the villains. *''The Pearl'' by John Steinbeck (1947) is a novel about a poor pearl diver, Kino, who finds the 'Pearl of Heaven', which is exceptionally valuable, changing his life forever. The novel explores themes of man's nature as well as greed and evil. *In ''South Sea Adventure'' (1952) by Willard Price the Hunt brothers, marooned on a coral island, use free diving to collect both pearls and fresh water.{{clarify|How does one collect fresh water by diving?|date=March 2021}} *In Ian Fleming's (1964) James Bond novel ''You Only Live Twice'', the character Kissy Suzuki is an ama diver. This connection was also mentioned in the film version. *''Man from Atlantis'' was a 1970s TV series which featured a superhero with the ability to breathe underwater and freedive in his own special way. *''The Big Blue'' (1988) is a romantic film about two world-class freedivers, a heavily fictionalized depiction of the rivalry of freedivers Jacques Mayol and Enzo Maiorca. *In the movie ''Phoenix Blue'' (2001), protagonist Rick is a musician who freedives competitively. *The children's novel ''The Dolphins of Laurentum'' by Caroline Lawrence (2003), which takes place in ancient Rome, describes the applications of freediving (sponge and pearl diving) and its hazards, as one of the principal characters, as well as the main antagonist, try to beat each other to a sunken treasure. *''The Freediver'' (2004) is a film about a talented female freediver who is discovered and brought to an island, where she is trained by an ambitious scientist to break a freediving world record currently held by an American woman. *In the film ''Into the Blue'' (2005) starring Jessica Alba, a group of divers find themselves in deep trouble with a drug lord after they come upon the illicit cargo of a sunken airplane in the Caribbean. Jessica Alba is an accomplished freediver, and did much of the underwater work; some other stunts were performed by Mehgan Heaney-Grier. *In Greg Iles' novel ''Blood Memory'' (2005), the main character Cat Ferry is an odontologist and a freediver. *''H2O: Just Add Water'' Series 3 added a freediver (Will Benjamin played by Luke Mitchell) as a regular. Freediving is featured in some episodes. *''The Greater Meaning of Water'' (2010) is an independent film about competitive constant weight freediving, focusing on the 'zen' of freediving. *In the Canadian television series ''Corner Gas'', the character Karen Pelly (Tara Spencer-Nairn) competed in static apnea, ranking fifth in Canada with a personal best of over six minutes. *In the American television series ''Baywatch'' episode "The Chamber" (Session 2, Episode 17), the character Mitch Buchannon rescues a diver trapped 90 feet below the ocean surface, but almost dies while suffering the effects of decompression sickness; decompression sickness is extremely implausible following freediving exposure to this depth. *In the book ''Hornblower and the Atropos'', CS Forester's character Horatio Hornblower is tasked by the Royal Navy to retrieve sunken treasure with the help of freediving Sinhalese pearl divers *In the film ''Avatar: The Way of Water'' the Metkayina Clan of the Na'vi have adapted to freediving and have built their entire culture around it, which they teach to the Sully family. *In Black Panther: Wakanda Forever a Mayan priest freedives and discovers a mutated plant that is used to mutate his tribe into merpeople.

== See also == * {{annotated link|British Freediving Association}} * {{annotated link|Nordic Deep}} * {{annotated link|Vertical Blue}} * {{annotated link|Skandalopetra diving}} * {{annotated link|Audrey Mestre}} * {{annotated link|Snorkeling}}

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<ref name="Krack et al 2006" >{{cite conference|url=https://www.diversalertnetwork.org/files/UHMS_DAN_2006_Breath-hold_Workshop_Proceedings.pdf|first1=Kirk |last1=Krack |first2=Martin |last2=Stepanek |first3=Mandy-Rae |last3=Cruickshank |title=Safety techniques and problem management in recreational and competitive freediving |editor1-last=Lindholm |editor1-first=P. |editor2-last=Pollock |editor2-first=N. W. |editor3-last=Lundgren |editor3-first=C. E. G.|year=2006|work=Breath-hold diving. Proceedings of the Undersea and Hyperbaric Medical Society/Divers Alert Network 2006 June 20–21 Workshop.|publisher=Divers Alert Network |pages=82–95 |access-date=27 January 2017|location=Durham, NC |isbn=978-1-930536-36-4 }}</ref>

<ref name="Kruger 2023" >{{Cite web|last=Krüger|first=Louise|date=20 June 2023|website=The Guardian|title='There is no mercy!': the young women swapping South Korea's work culture for freediving|url=https://www.theguardian.com/environment/2023/jun/20/there-is-no-mercy-the-young-women-swapping-south-koreas-work-culture-for-freediving|access-date=28 September 2024|archive-url=https://web.archive.org/web/20230620062322/https://www.theguardian.com/environment/2023/jun/20/there-is-no-mercy-the-young-women-swapping-south-koreas-work-culture-for-freediving|archive-date=20 June 2023}}</ref>

<ref name="Lane 2017">{{cite journal|last=Lane|first=Jordan D.|year=2017|title=Drowning Deaths From Unsupervised Breath Holding: Separating Necessary Training From Unwarranted Risk|journal=Military Medicine|volume=182|issue=January/February|pages=1471–|doi=10.7205/MILMED-D-16-00246|pmid=28051962|doi-access=free}}</ref>

<ref name="Lindholm 2006b" >{{cite conference|url=https://www.diversalertnetwork.org/files/UHMS_DAN_2006_Breath-hold_Workshop_Proceedings.pdf|last=Lindholm |first=Peter |title=Glossopharyngeal breathing and breath-hold diving on empty lungs |editor1-last=Lindholm |editor1-first=P. |editor2-last=Pollock |editor2-first=N. W. |editor3-last=Lundgren |editor3-first=C. E. G.|year=2006|work=Breath-hold diving. Proceedings of the Undersea and Hyperbaric Medical Society/Divers Alert Network 2006 June 20–21 Workshop.|publisher=Divers Alert Network |page=96 |access-date=24 January 2017|location=Durham, NC |isbn=978-1-930536-36-4 }}</ref>

<ref name="Lindholm Pollock and Lundgren 2006">{{cite book |title=Breath-hold diving. Proceedings of the Undersea and Hyperbaric Medical Society/Divers Alert Network 2006 June 20–21 Workshop. |editor1-last=Lindholm |editor1-first=P. |editor2-last=Pollock |editor2-first=N.W. |editor3-last=Lundgren |editor3-first=C.E.G. |year=2006 |publisher=Divers Alert Network |location=Durham, NC |isbn=978-1-930536-36-4 |url=http://archive.rubicon-foundation.org/5612 |archive-url=https://web.archive.org/web/20081007193626/http://archive.rubicon-foundation.org/5612 |url-status=usurped |archive-date=October 7, 2008 |access-date=2008-07-21 }}</ref>

<ref name="Melikhov 2022" >{{cite web |url=https://www.dansa.org/blog/2022/07/06/ensuring-safety-in-freediving-competitions |title=Ensuring Safety in Freediving Competitions |first=Oleg G. |last=Melikhov |date=6 July 2022 |website=DAN Southern Africa |access-date=19 August 2024 }}</ref>

<ref name="Mulder et al 2023" >{{cite journal |last1=Mulder |first1=E |last2=Staunton |first2=C |last3=Sieber |first3=A |last4=Schagatay |first4=E. |title=Unlocking the depths: multiple factors contribute to risk for hypoxic blackout during deep freediving |journal=Eur J Appl Physiol. |date=November 2023 |volume=123 |issue=11 |pages=2483–2493 |doi=10.1007/s00421-023-05250-z |pmid=37300699 |pmc=10615935 }}</ref>

<ref name="Nestor 2020">{{cite book |last=Nestor |first=James |title = Breath: The New Science of a Lost Art |date=26 May 2020 |publisher=Penguin Publishing Company |isbn=978-0-7352-1361-6 }}</ref>

<ref name="NYT">{{cite news |url = https://www.nytimes.com/2013/11/18/sports/deep-water-diver-from-brooklyn-dies-after-trying-for-a-record.html?pagewanted=1&_r=0&ref=international-home |title = A Deep-Water Diver From Brooklyn Dies After Trying for a Record |newspaper = The New York Times |first=Adam |last=Skolnick |date = 17 November 2013 |access-date = 30 November 2013 }}</ref>

<ref name="Ocean Men">{{cite web |title = Ocean Men: Extreme Dive (2001) |url = https://www.imdb.com/title/tt0330713/ |website=IMDb |publisher=IMDb.com, Inc. |access-date=15 June 2018 |date=31 August 2001b}}</ref>

<ref name="Owen 1955">{{cite book |first = David M. |last = Owen |year=1955 |title = A Manual for Free-Divers Using Compressed Air |publisher=Pergamon }}</ref>

<ref name="PADI certification">{{Cite web |title=Becoming a Certified PADI Freediver™ FAQs |url=https://www.padi.com/help/freediving-faq |access-date=2023-12-27 |website=PADI |language=en}}</ref>

<ref name="Panneton 2013" >{{cite journal |pmc=3768097 |year=2013 |last1=Panneton |first1=W. Michael |title=The Mammalian Diving Response: An Enigmatic Reflex to Preserve Life? |journal=Physiology |volume=28 |issue=5 |pages=284–297 |doi=10.1152/physiol.00020.2013 |pmid=23997188 }}</ref>

<ref name="Pearn et al 2015">{{cite journal |last1=Pearn |first1=John H.|first2=Richard C. |last2=Franklin |first3=Amy E. |last3=Peden |year=2015 |title=Hypoxic Blackout: Diagnosis, Risks, and Prevention |journal=International Journal of Aquatic Research and Education |via=ScholarWorks@BGSU |volume=9 |issue=3 |pages=342–347 |url=https://www.researchgate.net/publication/302442886|doi=10.25035/ijare.09.03.09|doi-access=free }}</ref>

<ref name="Pendergast and Lundgren 2009" >{{cite journal |title=The underwater environment: cardiopulmonary, thermal, and energetic demands |last1=Pendergast |first1=D.R. |first2=C.E.G. |last2=Lundgren |date=1 January 2009 |journal=Journal of Applied Physiology |volume=106 |issue=1 |doi=10.1152/japplphysiol.90984.2008 |pmid=19036887 |pages=276–283 |s2cid=2600072 |issn=1522-1601 }}</ref>

<ref name="phases" >{{cite web |url=http://beyondcoldwaterbootcamp.com/4-phases-of-cold-water-immersion |title=4 Phases of Cold Water Immersion |last= |work=Beyond Cold Water Boot Camp |publisher=Canadian Safe Boating Council |access-date=8 November 2013 |archive-date=17 February 2019 |archive-url=https://web.archive.org/web/20190217212924/http://beyondcoldwaterbootcamp.com/4-phases-of-cold-water-immersion }}</ref>

<ref name="Physiology and Pathophysiology" >{{cite journal |title=The physiology and pathophysiology of human breath-hold diving |journal=Journal of Applied Physiology |volume=106 |issue=1 |date=1 January 2009 |pages=284–292 |doi=10.1152/japplphysiol.90991.2008 |pmid=18974367 |first1=Peter |last1=Lindholm |first2=Claes E.G. |last2=Lundgren |bibcode=2009JAPh..106..284L |s2cid=6379788 }}</ref>

<ref name="pmid16602257">{{cite journal |last = Fitz-Clarke |first = J. R. |title=Adverse events in competitive breath-hold diving. |journal=Undersea Hyperb Med |year=2006 |volume=33 |issue=1 |pages=55–62 |pmid=16602257 |url = http://archive.rubicon-foundation.org/5016 |archive-url = https://web.archive.org/web/20080820002846/http://archive.rubicon-foundation.org/5016 |url-status = usurped |archive-date = August 20, 2008 |access-date=6 October 2013 }}</ref>

<ref name="pmid22753202">{{cite journal |author=Schagatay E |title=Predicting performance in competitive apnoea diving. Part I: static apnoea. |journal=Diving Hyperb Med |year=2009 |volume=39 |issue=2 |pages=88–99 |pmid=22753202 |url = http://archive.rubicon-foundation.org/9803 |archive-url = https://archive.today/20131008005248/http://archive.rubicon-foundation.org/9803 |url-status = usurped |archive-date = October 8, 2013 |access-date=6 October 2013 }}</ref>

<ref name="Potkin et al 2007" >{{cite journal |last1=Potkin |first1=Ralph |first2=Victor |last2=Cheng |first3=Robert |last3=Siege |date=1 September 2007 |title=Effects of glossopharyngeal insufflation on cardiac function: an echocardiographic study in elite breath-hold divers |journal=Journal of Applied Physiology |volume=103 |issue=3 |pages=823–827 |doi=10.1152/japplphysiol.00125.2007 |pmid=17556497 |issn=1522-1601 |citeseerx=10.1.1.550.5487 }}</ref>

<ref name="Rebikoff 1955">{{cite book |first=Dimitri |last=Rebikoff |year=1955 |title=Free Diving |publisher=Sidgwick & Jackson }}</ref>

<ref name="researchgate_359108430">{{cite report|url=https://www.researchgate.net/publication/359108430|journal=Biol. Mar. Mediterr. |date=2019 |volume=26 |issue=1 |pages=203–211 |first=S. |last=Rossi |publisher=Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento |location=Lecce, Italy. |title=Historical Ecology, Understanding the Present Panorama Using Past Scenarios }}</ref>

<ref name="Rincon 2018">{{Cite web|last=Rincon|first=Paul|date=20 April 2018|website=BBC|title=Bajau people 'evolved bigger spleens' for free-diving|url=https://www.bbc.com/news/science-environment-43823885|access-date=28 September 2024}}</ref>

<ref name="Rodríguez-Álvarez" >{{cite journal |url=https://www.researchgate.net/publication/376347369 |last1=Rodríguez-Álvarez |first1=Emilio |date=2023 |title=The Archaeology of Freediving: A Foundational Study. |journal=Studia Historica. Historia Antigua.|volume=41 |article-number=e31300 |doi=10.14201/shha31300 |issn=0213-2052 |doi-access=free |hdl=10150/672223 |hdl-access=free }}</ref>

<ref name="RRR10026">{{cite journal |last1=Simpson |first1=G. |last2=Ferns |first2=J. |last3=Murat |first3=S. |title=Pulmonary effects of 'lung packing' by buccal pumping in an elite breath-hold diver. |journal=Journal of the South Pacific Underwater Medicine Society |year=2003 |volume=33 |pages=122–126 |url = http://archive.rubicon-foundation.org/10026 |archive-url = https://archive.today/20131008005255/http://archive.rubicon-foundation.org/10026 |url-status = usurped |archive-date = October 8, 2013 |access-date=14 October 2016 }}</ref>

<ref name="RRR8947">{{cite journal |last=McKie |first=N. |title = Freediving in cyberspace. |journal=Journal of the South Pacific Underwater Medicine Society. |year=2004 |volume=34 |pages=101–03 |url = http://archive.rubicon-foundation.org/8947 |archive-url = https://archive.today/20131005155859/http://archive.rubicon-foundation.org/8947 |url-status = usurped |archive-date = October 5, 2013 |access-date = 5 October 2013 }}</ref>

<ref name="Russ">{{cite web |url = http://skindivinghistory.com/pioneers_fathers/women/dottie_frazier/Images/Dottie_The_Instructor/index.html |title = Dottie Frazier Pioneer/Women |last=Russ |website=skindivinghistory.com |access-date=2018-03-09 }}</ref>

<ref name="Seanomad">{{cite web |url = https://seanomad-freediving.com/en/content/history-freediving |title=History of freediving |website=seanomad-freediving.com |first=Christian |last=Engelbrecht |date=January 2009 |access-date=9 August 2020 }}</ref>

<ref name=shallow1968>{{cite journal |last1=Edmonds |first1=C. |title=Shallow Water Blackout. |journal=$Royal Australian Navy, School of Underwater Medicine |volume=RANSUM-8-68 |year=1968 |url=http://archive.rubicon-foundation.org/4954 |archive-url=https://archive.today/20130415185959/http://archive.rubicon-foundation.org/4954 |url-status=usurped |archive-date=April 15, 2013 |access-date=2008-07-21 }}</ref>

<ref name="Smith and Nakaya 2002" >{{cite conference|last1=Smith|first1=Adam|last2=Nakaya|first2=Seiji|title=Spearfishing – is it ecologically sustainable?|conference=3rd World Recreational Fishing Conference. 21–24 May 2002.|date=21–24 May 2002|pages=19–22|url=http://www.chbf.com/documents/sustainable_spearfishing.pdf|access-date=21 August 2013|archive-date=20 June 2012|archive-url=https://web.archive.org/web/20120620054917/http://www.chbf.com/documents/sustainable_spearfishing.pdf|url-status=dead}}</ref>

<ref name="Soltis">{{cite web|url=http://www.torgoenacademy.com/hook_article.htm|title=Power Breathing, the Jet Jock Style|last=Soltis|first=Matthew G.|work=Fighting G-LOC (how not to sleep while flying)|access-date=31 January 2017|archive-date=18 September 2016|archive-url=https://web.archive.org/web/20160918173633/http://www.torgoenacademy.com/hook_article.htm|url-status=dead}}</ref>

<ref name="Sooloo archipelago">[http://www.farlang.com/gemstones/streeter_pearls_and_pearling/page_137 Streeter's Pearls and pearling life] {{Webarchive|url=https://web.archive.org/web/20120815144035/http://www.farlang.com/gemstones/streeter_pearls_and_pearling/page_137 |date=2012-08-15 }} dedicates a chapter to the Sooloo islands. Streeter was one of the leading and most influential English jewelers in the 19th century and outfitted his own schooner the Shree-Pas-Sair which he sailed as well and on which he himself went pearl fishing in 1880. (For an illustration of divers on a schooner, see [http://www.farlang.com/gemstones/streeter_pearls_and_pearling/page_001 Pearl fishers obtaining the world's best pearls] {{Webarchive|url=https://web.archive.org/web/20120912060406/http://www.farlang.com/gemstones/streeter_pearls_and_pearling/page_001 |date=2012-09-12 }}. Streeter furthermore led a consortium to compete with Baron Rothschild to lease Ruby mines in Burma.</ref>

<ref name="Spearfishing rules">{{cite web |url = http://www.cmas.org/document?sessionId=&fileId=3749&language=1 |title = Underwater Fishing (Spear fishing) International Rules - English version |date= 23 January 2015 |website=www.cmas.org |publisher=World Underwater Federation (CMAS) |access-date=25 August 2017 }}</ref>

<ref name="Stratton 2019">{{Cite web|last=Stratton|first=Mark|date=5 May 2019|website=Wanderlust Magazine|title=Dispatches: Freediving with Japan's ama women|url=https://www.wanderlustmagazine.com/inspiration/diving-japan-ama-women/|access-date=28 September 2024|archive-url=https://web.archive.org/web/20240928115123/https://www.wanderlustmagazine.com/web/20240928115123/https://www.wanderlustmagazine.com/inspiration/diving-japan-ama-women/|archive-date=28 September 2024}}</ref>

<ref name="sterba" >{{cite journal |last=Sterba |first=J.A. |title=Field Management of Accidental Hypothermia during Diving |journal=US Navy Experimental Diving Unit Technical Report |volume=NEDU-1-90 |year=1990 }}</ref>

<ref name="Taillez et al 1957">{{cite book |author1-link = Philippe Tailliez |last1=Tailliez |first1=Philippe |author2-link = Frederic Dumas |last2=Dumas |first2=Frederic |author3-link = Jacques-Yves Cousteau |last3=Cousteau |first3=Jacques-Yves |display-authors=etal |year=1957 |title = The Complete Manual of Free Diving |publisher= G. P. Putnam's sons |location = New York }}</ref>

<ref name="Thucydides">{{cite book |author = Thucydides |author-link=Thucydides |translator-last=Crawley |translator-first=Richard |title=History of the Peloponnesian War |url = http://www.gutenberg.org/files/7142/7142-h/7142-h.htm |orig-date=431 BCE |year=2009 }}</ref>

<ref name="trademe">{{cite web |url = https://www.trademe.co.nz/sports/sports-memorabilia/other/auction-1487421899.htm |title = Willian Trubridge"World Freediving Record Holder" signed photograph |website=www.trademe.co.nz|access-date=9 August 2020 }}</ref>

<ref name="uhms1985">{{cite web |editor1-last=Lundgren |editor1-first=Claus E. G. |editor2-last=Ferrigno |editor2-first=Massimo |title=Physiology of Breath-hold Diving. 31st Undersea and Hyperbaric Medical Society Workshop |volume=UHMS Publication Number 72(WS-BH)4-15-87. |publisher=Undersea and Hyperbaric Medical Society |year=1985 |url=http://archive.rubicon-foundation.org/7992 |archive-url = https://web.archive.org/web/20090602002747/http://archive.rubicon-foundation.org/7992 |url-status = usurped |archive-date=June 2, 2009 |access-date=16 April 2009 }}</ref>

<ref name="UN News" >{{cite web|url=https://news.un.org/en/story/2025/03/1160491 |title=Bahrain's pearling legacy: Reviving a millennia-old culture |website=news.un.org |access-date=26 November 2025 }}</ref>

<ref name="usn" >{{cite book |title=US Navy Diving Manual, 6th revision |year=2006 |publisher=US Naval Sea Systems Command |location=United States |url=http://www.supsalv.org/00c3_publications.asp?destPage=00c3&pageID=3.9 |access-date=26 May 2008 |archive-date=2 May 2008 |archive-url=https://web.archive.org/web/20080502023541/http://www.supsalv.org/00c3_publications.asp?destPage=00c3&pageId=3.9 }}</ref>

<ref name="Valentina Cafolla smashes under-ice freediving record">{{cite web|url= https://divemagazine.com/scuba-diving-news/valentina-cafolla-smashes-under-ice-freediving-record |title=New CMAS World Record For Freediving Under Ice | date=23 February 2024|website= divemagazine |access-date=2 March 2024}}</ref>

<ref name="Vertical blue">{{Cite web |last1=depthdev.com |last2=Development |first2=Depth |title=News {{!}} VERTICAL BLUE |url=http://events.verticalblue.net/ |access-date=2023-07-26 |website=News {{!}} VERTICAL BLUE |archive-date=2018-09-26 |archive-url=https://web.archive.org/web/20180926225002/http://events.verticalblue.net/ |url-status=dead }}</ref>

<ref name="Warsh 2010" >{{cite journal |last=Warsh |first=M. A. |date=2010 |title=Enslaved Pearl Divers in the Sixteenth Century Caribbean. |journal=Slavery & Abolition |volume=31 |issue=3 |pages=345–362 |doi=10.1080/0144039X.2010.504540 }}</ref>

<ref name="where played">{{cite web |title = Where is it Played |url = http://www.underwaterfootball.com/where_is_it_played.html |website = underwaterfootball.com |access-date = 7 November 2014 }}</ref>

<ref name="Wong 1999">{{cite journal |last=Wong |first = R. M. |title = Taravana revisited: Decompression illness after breath-hold diving |journal=South Pacific Underwater Medicine Society Journal |volume=29 |issue=3 |year=1999 |issn=0813-1988 |oclc=16986801 |url = http://archive.rubicon-foundation.org/6010 |access-date=8 April 2008 |archive-url = https://web.archive.org/web/20090821162235/http://archive.rubicon-foundation.org/6010 |archive-date = 21 August 2009 |url-status=usurped }}</ref>

<ref name="worldrecords-AIDA">{{cite web |url = https://apnoetauchen-lernen.de/kurse/ausbildung/weltrekorde/ |title = Apnoetauchen Rekorde: Alle Weltrekorde (2020) |date=2020-01-24 |website=apnoetauchen-lernen.de |language=de-DE |access-date=2020-05-28 }}</ref>

<ref name="Yiafas" >{{cite web |url=https://www.emotions.blue/blog/item/ten-points-for-planning-a-safe-and-successful-freedive |title=10 Points For Successful And Safe Freedive |first=Andreas |last=Yiafas |website=www.emotions.blue }}</ref>

<ref name="youtube full">{{YouTube |id = NPAXrak9i7Q |title = My Pilot, Whale }} Dolphin_Embassy, 24 July 2015</ref> }}

==Further reading== *DeeperBlue.com (2016) ''The Beginners Guide to Freediving'', published by [https://www.deeperblue.com/beginners-guide-freediving/ DeeperBlue.com] *Callagy, Feargus (2012) ''A Beginners Guide to Freediving'', e-book published by [http://exclusives.deeperblue.com/products/a-beginners-guide-to-freediving DeeperBlue.com] {{Webarchive|url=https://web.archive.org/web/20120904010431/http://exclusives.deeperblue.com/products/a-beginners-guide-to-freediving |date=2012-09-04 }} *Donald, Ian (2013) ''Underwater foraging – Freediving for food'', Createspace publishing, USA. {{ISBN|978-1484904596}} *Farrell, Emma (2006) ''One Breath: A Reflection on Freediving'', photographs by Frederic Buyle, Pynto Ltd., Hatherley, UK: {{ISBN|0-9542315-2-X}} *Pelizzari, Umberto & Tovaglieri, Stefano (2001) ''Manual of Freediving: Underwater on a single breath'', English translation 2004 by Idelson-Gnocchi Ltd., Reddick, FL: {{ISBN|1928649270}} *Severinsen, Stig A. (2010) ''Breathology: The Art of Conscious Breathing'', Idelson-Gnocchi Ltd., Reddick, FL: {{ISBN|978-1928649342}} *James Nestor (2015) "Deep: Freediving, Renegade Science, and What the Ocean Tells Us About Ourselves", Eamon Dolan/Mariner Books New York, NY: {{ISBN|978-0544484078}}

==External links== {{Wiktionary}} {{Commons category|Freediving}} *[http://www.aidainternational.org/ AIDA International] *[https://archive.today/20130116061751/http://g.co/maps/4eb9a Collaborative cartography of freediving spots/Cartographie collaborative des spots apnée] {{in lang|fr}} *[http://www.deeperblue.com/ DeeperBlue website] *[https://www.deeperblue.com/beginners-guide-freediving/ The Beginners Guide to Freediving] - published by DeeperBlue.com *[http://www.FreedivingCourses.com FreedivingCourses.com] - a way to find Freediving instructors and dive centers around the world *[https://web.archive.org/web/20190130230752/http://divewise.org/ DiveWise.Org] - non profit organization dedicated to freediving education and safety *[https://web.archive.org/web/20141120074435/http://www.explorefreediving.com/ Explore Freediving] - Freediving and Snorkeling events and instructor directory *[https://web.archive.org/web/20140810100809/http://travelbyfins.com/ Freediving Spots] *[https://freedivecentral.com Freedive Central] - The ultimate platform for freediving professionals *[http://www.borgosub.fr/ Borgosub.fr ] {{Webarchive|url=https://web.archive.org/web/20150225155057/http://www.borgosub.fr/ |date=2015-02-25 }} French association to promote Wreck freediving *[https://www.freitauchen-lernen.com/ Freitauchen-lernen.com] - deutschsprachiger Freediving Blog *[https://www.apnoetauchen-lernen.de/ www.apnoetauchen-lernen.de] - German Center for education and development of freediving. *[https://freediveschool.com/blog/ Freediving blog] - Trusted knowledge hub for freediving *[https://freedivingbase.com freedivingbase website] - Discover top-rated freediving schools and world-class dive destinations {{UnderwaterDiving|frediv}} {{Extreme Sports}}

{{DEFAULTSORT:Free Diving}} Category:Freediving Category:Individual sports Category:Underwater sports Category:Underwater diving modes