Southeast Asian Games - Swimming - Aquatic Sports Palace, National Sports Complex, Hanoi, Vietnam - May 18, 2022 Thailand's Kitiphat Pipimnan in action during the men's 50m breaststroke final REUTERS/Chalinee Thirasupa 

Southeast Asian Games - Swimming - Aquatic Sports Palace, National Sports Complex, Hanoi, Vietnam - May 18, 2022 General view at the start of the Women's 4 X 100m Medley Relay REUTERS/Chalinee Thirasupa 

Southeast Asian Games - Swimming - Aquatic Sports Palace, National Sports Complex, Hanoi, Vietnam - May 17, 2022 Vietnam's Nguyen Tran Hung in action during the Men's 4x200 Freestyle Relay Final REUTERS/Navesh Chitrakar 

Swimmers take a dip in the cold water on the opening day of the pool season at Wannsee lido, as the event was cancelled for two years in a row amid the coronavirus disease (COVID-19) outbreak in Berlin, Germany, April 15, 2022. REUTERS/Fabrizio Bensch 

Fernando Sergio Paneque, 80, swims in the sea during a training session in Havana, Cuba, February 26, 2022. REUTERS/Amanda Perobelli 

Fernando Sergio Paneque, 80, swims during the Campeonato Nacional de Natacion Master (National Master Swimming Championship) in Havana, Cuba, February 6, 2022. Picture taken February 6, 2022. REUTERS/Amanda Perobelli 

Eunice Lores, 72, greets another competitor during the Campeonato Nacional de Natacion Master (National Master Swimming Championship) in Havana, Cuba, February 5, 2022. Picture taken February 5, 2022. REUTERS/Amanda Perobelli 

Penguins swim in the sea as scientists investigate the impact of climate change on Antarctica's penguin colonies, on the northern side of the Antarctic peninsula, Antarctica January 15, 2022. Picture taken January 15, 2022. REUTERS/Natalie Thomas 

Participants wearing protective face masks amid the coronavirus disease (COVID-19) outbreak, pray as they take an ice-cold bath during a ceremony to purify their souls and to wish for overcoming the pandemic at the Teppozu Inari shrine in Tokyo, Japan, January 9, 2022. REUTERS/Kim Kyung-Hoon 

Swimmers wearing fancy dress costumes take to the water at a New Year's Day event in Manchester, Britain, January 1, 2022. REUTERS/Jason Cairnduff 

A swimmer wearing fancy dress costume takes to the water at a New Year's Day event in Manchester, Britain, January 1, 2022. REUTERS/Jason Cairnduff 

Soccer Football - Copa Libertadores - Semi Final - Second Leg - Atletico Mineiro v Palmeiras - Estadio Mineirao, Belo Horizonte, Brazil - September 28, 2021 Palmeiras' Gabriel Veron wearing a swimming cap for protection Pool via REUTERS/Douglas Magno 

Tokyo 2020 Olympics - Swimming - Men's 1500m Freestyle - Final - Tokyo Aquatics Centre - Tokyo, Japan - August 1, 2021. Robert Finke of the United States adjusts his cap ahead of race REUTERS/Annegret Hilse 

Tokyo 2020 Olympics - Swimming - Men's 800m Freestyle - Final - Tokyo Aquatics Centre - Tokyo, Japan - July 29, 2021. Robert Finke of the United States adjusts his cap. REUTERS/Marko Djurica 

Tokyo 2020 Olympics - Swimming - Men's 200m Backstroke - Heats - Tokyo Aquatics Centre - Tokyo, Japan - July 28, 2021. Radoslaw Kawecki of Poland adjusts his swimming cap. REUTERS/Aleksandra Szmigiel 

Tokyo 2020 Olympics - Swimming - Men's 100m Freestyle - Heats - Tokyo Aquatics Centre - Tokyo, Japan - July 27, 2021. Jacob Whittle of Britain removes his cap REUTERS/Marko Djurica 

Tokyo 2020 Olympics - Swimming - Women's 400m Freestyle - Final - Tokyo Aquatics Centre - Tokyo, Japan - July 26, 2021. Kathleen Ledecky of the United States adjusts her cap. REUTERS/Marko Djurica 

Members of the U.S. National Artistic Swimming team, who were unable to swim for three months last year during the California stay-at-home order to prevent the spread of the coronavirus disease (COVID-19), prepare to train for the Tokyo Olympics at the SODA Aquatic center in Moraga, California, U.S., May 5, 2021. Picture taken May 5, 2021. REUTERS/Aude Guerrucci 

The U.S. National Artistic Swimming team, who were unable to swim for three months last year during the California stay-at-home order to prevent the spread of the coronavirus disease (COVID-19), trains for the Tokyo Olympics at the SODA Aquatic center in Moraga, California, U.S., May 5, 2021. Picture taken May 5, 2021. REUTERS/Aude Guerrucci 

Swimmers train at Hampton Lido on the first day that outdoor pools are open following the easing of lockdown restrictions, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, March 29, 2021. REUTERS/Toby Melville 

Swimmers train at Hampton Lido on the first day that outdoor pools are open following the easing of lockdown restrictions, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, March 29, 2021. REUTERS/Toby Melville 

Swimmers train at Hampton Lido on the first day that outdoor pools are open following the easing of lockdown restrictions, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, March 29, 2021. REUTERS/Toby Melville 

Swimmers take part in an aqua aerobics class in Hampton Lido on the first day that outdoor pools are open following the easing of lockdown restrictions, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, March 29, 2021. REUTERS/Toby Melville 

Swimmers take part in an aqua aerobics class in Hampton Lido on the first day that outdoor pools are open following the easing of lockdown restrictions, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, March 29, 2021. REUTERS/Toby Melville 

Swimmers take part in an aqua aerobics class in Hampton Lido on the first day that outdoor pools are open following the easing of lockdown restrictions, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, March 29, 2021. REUTERS/Toby Melville 

People swim in Charlton Lido on the first day that outdoor pools are open following the easing of lockdown restrictions, amid the spread of the coronavirus disease (COVID-19) outbreak, in London, Britain, March 29, 2021. REUTERS/Henry Nicholls 

Swimmers train in Hampton Lido on the first day that outdoor pools are open following the easing of lockdown restrictions, amid the spread of the coronavirus disease (COVID-19) pandemic in London, Britain, March 29, 2021. REUTERS/Toby Melville 

An elderly winter swimmer puts on a swimming cap before she dives into a river on a cold winter day in Beijing, China, January 6, 2021. REUTERS/Tingshu Wang 

A man stretches his swimming cap over his head before entering the sea at Blackrock diving tower on a cold evening winter sunset amid the continuing coronavirus disease (COVID-19) outbreak in Galway, Ireland, December 3, 2020. REUTERS/Clodagh Kilcoyne 

Swimming - Gold Coast 2018 Commonwealth Games - Men's 50m Freestyle - Heats - Optus Aquatic Centre - Gold Coast, Australia - April 9, 2018. Benjamin Proud (in red cap) of England dives into the water with fellow competitors during heat 8 of the men's 50m freestyle competition. REUTERS/David Gray 

Swimming - Gold Coast 2018 Commonwealth Games - Men's 50m Freestyle - Heats - Optus Aquatic Centre - Gold Coast, Australia - April 9, 2018. Benjamin Proud (in red cap) of England dives into the water with fellow competitors during heat 8 of the men's 50m freestyle competition. REUTERS/David Gray 

A resident stretches before swimming in Houhai lake, partially covered with ice during winter, in central Beijing, China, December 14, 2016. REUTERS/Jason Lee 

A winter swimmer swims after breaking the ice on a frozen lake at a park in Shenyang, China, December 9, 2016. REUTERS/Sheng Li TPX IMAGES OF THE DAY 

Participants wear Santa Claus caps as they swim through the Limmat river during the traditional Samichlausschwimmen public swim event in Zurich, Switzerland December 4, 2016. REUTERS/Arnd Wiegmann REUTERS/Arnd Wiegmann 

2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA prepares to swim with an inverted Speedo cap borrowed from teammate Conor Dwyer after his own "MP" cap ripped. Picture taken August 9, 2016. REUTERS/Michael Dalder 

2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA wears an "MP" branded cap before the start of the 4 X 200m freestyle relay race. Picture taken August 9, 2016. REUTERS/Michael Dalder 

2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA swims with an inverted Speedo cap borrowed from teammate Conor Dwyer after his own "MP" cap ripped. Picture taken August 9, 2016. REUTERS/Michael Dalder 

2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA prepares to swim with an inverted Speedo cap borrowed from teammate Conor Dwyer after his own "MP" cap ripped. Picture taken August 9, 2016. REUTERS/Michael Dalder 

A member of the Clovelly Eskimos winter swimming club adjusts her cap before the start of a race at Clovelly Beach in Sydney, Australia, May 15, 2016. Picture taken May 15, 2016. REUTERS/David Gray SEARCH "WINTER SWIMMING" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

First placed Daiya Seto of Japan poses with his cap after the men's 400m individual medley final at the Aquatics World Championships in Kazan, Russia, August 9, 2015. REUTERS/Hannibal Hanschke 

Elizabeth Beisel of the U.S. adjusts her cap following the women's 400m individual medley heats at the Aquatics World Championships in Kazan, Russia August 9, 2015. REUTERS/Hannibal Hanschke

Australia's sisters Bronte (L) and Cate Campbell walk after the women's 50m freestyle heats at the Aquatics World Championships in Kazan, Russia, August 8, 2015. REUTERS/Hannibal Hanschke

China's Ning Zetao celebrates after winning the men's 100m freestyle final at the Aquatics World Championships in Kazan, Russia, August 6, 2015. REUTERS/Michael Dalder

China's Ning Zetao celebrates after winning the men's 100m freestyle final at the Aquatics World Championships in Kazan, Russia, August 6, 2015. REUTERS/Michael Dalder

China's Ning Zetao celebrates after winning the men's 100m freestyle final at the Aquatics World Championships in Kazan, Russia, August 6, 2015. REUTERS/Michael Dalder

Florent Manaudou of France removes cap after the men's 50m butterfly semi-final at the Aquatics World Championships in Kazan, Russia, August 2, 2015. REUTERS/Michael Dalder

Vladimir Korabelnikov, head of a local orphanage and a member of local winter swimming club, warms up on the bank of the Yenisei River ahead of his weekly bathing session, with the air temperature at about minus 20 degrees Celsius (minus 4 degrees Fahrenheit), in the town of Divnogorsk near Krasnoyarsk, Siberia, February 20, 2015. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY ENVIRONMENT TPX IMAGES OF THE DAY) 

A man swims in the Serpentine lake after snowfall in central London February 3, 2015. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SOCIETY) 

A swimmer reacts after finishing his competition in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. The swimming competition was held on the official launch day of the Harbin International Ice and Snow Sculpture Festival. REUTERS/Kim Kyung-Hoon (CHINA - Tags: SPORT SWIMMING TRAVEL SOCIETY ENVIRONMENT TPX IMAGES OF THE DAY) 

A swimmer takes an early morning dip in the Serpentine lake at Hyde Park in central London October 31, 2014. Britain's Meteorological Office reported that temperatures in London would reach 21 celsius on Friday, making it the warmest Halloween on record. REUTERS/Toby Melville (BRITAIN - Tags: ANNIVERSARY ENVIRONMENT SOCIETY) 

Bronze medallist Yasuhiro Koseki of Japan competes in the Men's 200m Breaststroke final at the Munhak Park Tae-hwan Aquatics Center during the 17th Asian Games in Incheon September 23, 2014. REUTERS/Tim Wimborne (SOUTH KOREA - Tags: SPORT SWIMMING) 

China's Sun Yang wears his swimming cap at Munhak Park Tae-hwan Aquatics Center during a practice session for the swimming competition for the 17th Asian Games in Incheon September 17, 2014. REUTERS/Kim Kyung-Hoon (SOUTH KOREA - Tags: SPORT SWIMMING) 

France's Florent Manaudou removes his cap after winning his men's 50m freestyle semi-final during the World Swimming Championships at the Sant Jordi arena in Barcelona August 2, 2013. REUTERS/Albert Gea (SPAIN - Tags: SPORT SWIMMING)

Ryan Lochte of the U.S adjusts his cap before competing in the 200m backstroke semi- final during the World Swimming Championships at the Sant Jordi arena in Barcelona August 1, 2013. REUTERS/Michael Dalder (SPAIN - Tags: SPORT SWIMMING)

A boy jumps from a diving platform in front of the mountains Eiger (L-R) Moench and Jungfrau in a public swimming pool in Thun August 1, 2013. REUTERS/Ruben Sprich (SWITZERLAND - Tags: ENVIRONMENT TPX IMAGES OF THE DAY) 

Katie Ledecky of the U.S. (R) takes off her cap beside second place Denmark's Lotte Friis after winning the women's 1500m freestyle final during the World Swimming Championships at the Sant Jordi arena in Barcelona July 30, 2013. REUTERS/Michael Dalder (SPAIN - Tags: SPORT SWIMMING)

Ryan Lochte (C) of the U.S. adjusts his swimming cap before the start of his men's 200m freestyle semi-final during the World Swimming Championships at the Sant Jordi arena in Barcelona July 29, 2013. REUTERS/Michael Dalder (SPAIN - Tags: SPORT SWIMMING)

Sweden's Sarah Sjostrom celebrates after winning the women's 100m butterfly final during the World Swimming Championships at the Sant Jordi arena in Barcelona July 29, 2013. REUTERS/Michael Dalder (SPAIN - Tags: SPORT SWIMMING TPX IMAGES OF THE DAY)

A competitor swims with a cap displaying the word "SWIM" during the UK Cold Water Swimming Championships at Tooting Bec Lido in south London January 26, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: SOCIETY SPORT)