A member of an ice swimming club wearing a carnival costume attends a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

A member of an ice swimming club wearing a carnival costume attends a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Members of an ice swimming club wearing carnival costumes attend a traditional winter swimming event at the Oranke Lake in Berlin, Germany, January 11, 2020. REUTERS/Hannibal Hanschke

Swimmers wearing fancy dress costumes take part in the annual New Year's Day Swim, in Saundersfoot, Wales, Britain January 1, 2020. REUTERS/Rebecca Naden

Swimmers wearing fancy dress costumes take part in the annual New Year's Day Swim, in Saundersfoot, Wales, Britain January 1, 2020. REUTERS/Rebecca Naden

Swimmers wearing fancy dress costumes take part in the annual New Year's Day Swim, in Saundersfoot, Wales, Britain January 1, 2020. REUTERS/Rebecca Naden

Swimmers wearing fancy dress costumes take part in the annual New Year's Day Swim, in Saundersfoot, Wales, Britain January 1, 2020. REUTERS/Rebecca Naden

Swimmers wearing fancy dress costumes take part in the annual New Year's Day Swim in Saundersfoot, Wales, Britain January 1, 2020. REUTERS/Rebecca Naden

Swimmers wearing fancy dress costumes take part in the annual New Year's Day Swim, in Saundersfoot, Wales, Britain January 1, 2020. REUTERS/Rebecca Naden

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day Swim in Dunkirk, France January 1, 2020. REUTERS/Pascal Rossignol

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

A swimmer wearing a costume bathes in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

A swimmer wearing a costume bathes in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

A swimmer wearing a horse costume bathes in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

Swimmers wearing costumes bathe in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

A swimmer wearing a costume bathes in the 3 degrees Celsius water of the river Danube during their annual 4 km swim, in Neuburg an der Donau, January 26, 2019. REUTERS/Andreas Gebert

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

A woman wearing costume participates in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

People wearing costumes participate in a traditional New Year's Day swim in Dunkirk, France January 1, 2019. REUTERS/Pascal Rossignol

A diver wearing a Santa Claus costume swims in a large fish tank during an underwater performance at Sunshine Aquarium in Tokyo, Japan, December 18, 2018. REUTERS/Issei Kato TPX IMAGES OF THE DAY

Divers wearing Santa Claus and Red-Nosed Reindeer costumes swim in a large fish tank during an underwater performance at Sunshine Aquarium in Tokyo, Japan, December 18, 2018. REUTERS/Issei Kato

Divers wearing Santa Claus and Red-Nosed Reindeer costumes swim in a large fish tank during an underwater performance at Sunshine Aquarium in Tokyo, Japan, December 18, 2018. REUTERS/Issei Kato

A diver wearing a Santa Claus costume swims in a large fish tank during an underwater performance at Sunshine Aquarium in Tokyo, Japan, December 18, 2018. REUTERS/Issei Kato

Divers wearing Santa Claus and Red-Nosed Reindeer costumes swim in a large fish tank during an underwater performance at Sunshine Aquarium in Tokyo, Japan, December 18, 2018. REUTERS/Issei Kato

A boy jumps into the river of Nestos in Galani village near the city of Xanthi, Greece August 13, 2018. REUTERS/Yiannis Kourtoglou

Kids cool off in the spray of water from an outdoor waterpark fountain in downtown San Diego, California, U.S. July 5, 2018. REUTERS/Mike Blake

A man jumps into the sea at Salthill beach during sunny weather in Galway, Ireland June 26, 2018. REUTERS/Clodagh Kilcoyne TPX IMAGES OF THE DAY