Flood water is seen at a doorway in a multi-storey car park as flood waters reached up to 1.5 meters and destroyed multiple cars, in Galway, Ireland January 3, 2018. REUTERS/Clodagh Kilcoyne 

Fish are seen for sale at "Wildwoods" in Crews Hill, Enfield, Britain December 4, 2017. REUTERS/ Tom Jacobs 

Fish are seen for sale at "Wildwoods" in Crews Hill, Enfield, Britain December 4, 2017. REUTERS/ Tom Jacobs 

A Siamese fighting fish is seen for sale at "Wildwoods" in Crews Hill, Enfield, Britain December 4, 2017. REUTERS/ Tom Jacobs 

A woman dives and pretends to ride a bike in Underwater Park in Pula, Croatia, August 1, 2017. REUTERS/Antonio Bronic 

A tadpole swims over an underwater leaf in the Bressonne Pond at the Chalet-a-Gobet, in Lausanne, Switzerland May 5, 2017. REUTERS/Denis Balibouse 

Brazil's Ministry of Science, Technology, Innovation and Communications Gilberto Kassab speaks during the ceremony for the EllaLink undersea telecommunications cable between Brazil and Spain in Sao Paulo, Brazil, April 24, 2017. REUTERS/Nacho Doce 

Spain's Prime Minister Mariano Rajoy looks at Brazil's Ministry of Science, Technology, Innovation and Communications Gilberto Kassab (C) and Brazil's Foreign Minister Aloysio Nunes (R) during the ceremony for the EllaLink undersea telecommunications cable between Brazil and Spain in Sao Paulo, Brazil, April 24, 2017. REUTERS/Nacho Doce 

Brazil's Ministry of Science, Technology, Innovation and Communications Gilberto Kassab (L) and Foreign Minister Aloysio Nunes talk during the ceremony for the EllaLink undersea telecommunications cable between Brazil and Spain in Sao Paulo, Brazil, April 24, 2017. REUTERS/Nacho Doce 

Spain's Prime Minister Mariano Rajoy and Brazil's Ministry of Science, Technology, Innovation and Communications Gilberto Kassab are seen during the ceremony for the EllaLink undersea telecommunications cable between Brazil and Spain in Sao Paulo, Brazil, April 24, 2017. REUTERS/Nacho Doce 

Spain's Prime Minister Mariano Rajoy speaks during the ceremony for the EllaLink undersea telecommunications cable between Brazil and Spain in Sao Paulo, Brazil, April 24, 2017. REUTERS/Nacho Doce 

Spain's Prime Minister Mariano Rajoy speaks during the ceremony for the EllaLink undersea telecommunications cable between Brazil and Spain in Sao Paulo, Brazil, April 24, 2017. REUTERS/Nacho Doce 

Spanish Prime Minister Mariano Rajoy speaks during the ceremony for the EllaLink undersea telecommunications cable between Brazil and Spain in Sao Paulo, Brazil, April 24, 2017. REUTERS/Nacho Doce 

A man takes a dip in icy waters of the Dnieper river during Orthodox Epiphany celebrations in the town of Vyshgorod, Ukraine January 19, 2017. REUTERS/Gleb Garanich 

Five-month-old baby elephant Fah Jam swims during a hydrotherapy treatment as part of a lengthy rehabilitation process to heal her injured front left foot at a rehabilitation center in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. REUTERS/Athit Perawongmetha TPX IMAGES OF THE DAY 

Humboldt penguins swim in their pool during the annual stocktake at London Zoo in London, Britain January 3, 2017. REUTERS/Stefan Wermuth 

Humboldt penguins swim in their pool during the annual stocktake at London Zoo in London, Britain January 3, 2017. REUTERS/Stefan Wermuth 

A swan searches for food as it swims in Hyde Park in central London, Britain January 2, 2017. REUTERS/Stefan Wermuth 

An Australia sea lion licks a frozen treat underwater that contains a fish during an annual Christmas event in which animals receive special food gifts at Sydney's Taronga Zoo in Australia, December 21, 2016. REUTERS/David Gray TPX IMAGES OF THE DAY 

A performer practices her mermaid swim next to a shark in an aquarium after graduating from a mermaid workshop in Guangzhou, Guangdong Province, China December 16, 2016. Picture taken December 16, 2016. REUTERS/Tyrone Siu TPX IMAGES OF THE DAY 

Nelson's Column statue is seen between commemorative poppies floating in a fountain in this photograph taken underwater in Trafalgar Square during an Armistice Day event in London, Britain, November 11, 2016. REUTERS/Toby Melville 

The roof a student driver car is pictured partly underwater as a result of Hurricane Matthew in Lumberton, North Carolina, U.S. October 10, 2016. REUTERS/Carlo Allegri TPX IMAGES OF THE DAY

Brazil's Paralympic swimmer Daniel Dias poses for a photograph during a training session at an indoor swimming pool in Braganca Paulista, Sao Paulo state, Brazil June 22, 2016. REUTERS/Nacho Doce 

Brazil's Paralympic swimmer Daniel Dias trains at an indoor swimming pool in Braganca Paulista, Sao Paulo state, Brazil June 22, 2016. REUTERS/Nacho Doce 

Brazil's Paralympic swimmer Daniel Dias trains at an indoor swimming pool in Braganca Paulista, Sao Paulo state, Brazil June 22, 2016. REUTERS/Nacho Doce 

A bust of Soviet state founder Vladimir Lenin with Soviet-era sculpures are seen at the "Alley of Leaders" underwater museum off the coast of Cape Tarhankut, Crimea, July 17, 2016. REUTERS/Maxim Zmeyev 

Children attend a swim training session at Hangzhou Chen Jinglun Sport school Natatorium, where Chinese Olympic swimmer Sun Yang and Fu Yuanhui also trained, in Hangzhou, Zhejiang province, China, August 10, 2016. REUTERS/Aly Song 

Children attend a swim training session at Hangzhou Chen Jinglun Sport school Natatorium, where Chinese Olympic swimmer Sun Yang and Fu Yuanhui also trained, in Hangzhou, Zhejiang province, China, August 10, 2016. REUTERS/Aly Song 

Children attend a swim training session at Hangzhou Chen Jinglun Sport school Natatorium, where Chinese Olympic swimmer Sun Yang and Fu Yuanhui also trained, in Hangzhou, Zhejiang province, China, August 10, 2016. REUTERS/Aly Song 

Children attend a swim training session at Hangzhou Chen Jinglun Sport school Natatorium, where Chinese Olympic swimmer Sun Yang and Fu Yuanhui also trained, in Hangzhou, Zhejiang province, China, August 10, 2016. REUTERS/Aly Song 

Children attend a swim training session at Hangzhou Chen Jinglun Sport school Natatorium, where Chinese Olympic swimmer Sun Yang and Fu Yuanhui also trained, in Hangzhou, Zhejiang province, China, August 10, 2016. REUTERS/Aly Song 

A member of the Maroubra Winter Seals swimming club prepares to dive into a rock pool as a fellow member swims underneath him at Maroubra Beach in Sydney, Australia, June 19, 2016. Picture taken June 19, 2016. REUTERS/David Gray SEARCH "WINTER SWIMMING" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

Water polo - Brazil men's team training - Rio de Janeiro, Brazil - 5/7/16 - Goalkeeper Slobodan Soro warms up. REUTERS/Sergio Moraes 

Brazil's synchronised swimmers Maria Eduarda Miccuci (R) and Luisa Borges perform during a photo session at the Rio Olympic Park in Rio de Janeiro, Brazil, April 29, 2016. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

Brazil's synchronised swimmers Maria Eduarda Miccuci (R) and Luisa Borges perform during a photo session at the Rio Olympic Park in Rio de Janeiro, Brazil, April 29, 2016. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

Brazil's synchronised swimming team performs during a training session at the Maria Lenk Aquatic Centre in Rio de Janeiro, Brazil, May 20, 2016. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Brazil's synchronised swimming team performs during a training session at the Maria Lenk Aquatic Centre in Rio de Janeiro, Brazil, May 20, 2016. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

Brazil's synchronised swimmers Luisa Borges (R) and Maria Eduarda Miccuci pose for a photograph after a training session at the Rio Olympic Park in Rio de Janeiro, Brazil, April 7, 2016. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

Brazil's synchronised swimming team poses for a photograph after a training session at the Maria Lenk Aquatic Centre in Rio de Janeiro, Brazil, May 20, 2016. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

Brazil's synchronised swimmers Luisa Borges (front) and Maria Eduarda Miccuci perform during a training session at the Rio Olympic Park in Rio de Janeiro, Brazil, April 7, 2016. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY 

Brazil's synchronised swimmers Maria Eduarda Miccuci (R) and Luisa Borges perform during a photo session at the Rio Olympic Park in Rio de Janeiro, Brazil, April 29, 2016. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Brazil's synchronised swimming team is planning to make waves when Rio de Janeiro in August becomes the first South American city ever to host the Olympics. In a country best known for soccer and volleyball, the eight-member squad hopes that a strong home-team performance can help raise the profile of synchronised swimming and get more Brazilians interested in a sport that too many people see merely as some light-hearted dance in the water. REUTERS/Pilar Olivares SEARCH "SYNC SWIM" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY Matching text OLYMPICS-RIO/SYNCHRONIZED SWIMMING

Reissue. Graphic describing sound frequency and how an Underwater Locator Beacon works. Includes chart with frequencies of common undersea sounds. 

Rosana Vieira Alves and her 5-month-old daughter Luana Vieira, who was born with microcephaly, pose for picture in the sea of Porto de Galinhas, a beach located in Ipojuca, in the state of Pernambuco, Brazil, March 2, 2016. REUTERS/Ueslei Marcelino 

Rosana Vieira Alves and her 5-month-old daughter Luana Vieira, who was born with microcephaly, pose for a picture in the sea of Porto de Galinhas, a beach located in Ipojuca, in the state of Pernambuco, Brazil, March 2, 2016. REUTERS/Ueslei Marcelino TPX IMAGES OF THE DAY

A baby hippo swims under the water in its enclosure at Prague Zoo, Czech Republic, February 24, 2016. It was born on January 28, 2016. REUTERS/David W Cerny 

A baby hippo swims under the water in its enclosure at Prague Zoo, Czech Republic, February 24, 2016. It was born on January 28, 2016. REUTERS/David W Cerny 

A baby hippo swims under the water in its enclosure at Prague Zoo, Czech Republic, February 24, 2016. It was born on January 28, 2016. REUTERS/David W Cerny 

A baby hippo swims under the water near its mother Maruska in their enclosure at Prague Zoo, Czech Republic, February 24, 2016. The baby hippo was born on January 28, 2016. REUTERS/David W Cerny 

'Debbie', a 56-day-old dolphin baby is seen from underwater as she swims next to her mother 'Delphi' at the zoo in Duisburg, Germany February 17, 2016. 'Debbie' was born on Christmas Eve and was presented to the public at Duisburg's zoo on Wednesday. REUTERS/Wolfgang Rattay

'Debbie', a 56-day-old dolphin baby is seen from underwater as she swims next to her mother 'Delphi' at the zoo of Duisburg, western Germany February 16, 2016. 'Debbie' was born on Christmas Eve and was presented to the public in Duisburg's zoo on Wednesday. REUTERS/Wolfgang Rattay

'Debbie', a 56-day-old dolphin baby is seen from underwater as she swims next to her mother 'Delphi' at the zoo of Duisburg, western Germany February 16, 2016. 'Debbie' was born on Christmas Eve and was presented to the public in Duisburg's zoo on Wednesday. REUTERS/Wolfgang Rattay 

'Debbie', a 56-day-old dolphin baby is seen from underwater as she swims next to her mother 'Delphi' at the zoo in Duisburg, Germany February 17, 2016. 'Debbie' was born on Christmas Eve and was presented to the public at Duisburg's zoo on Wednesday. REUTERS/Wolfgang Rattay

'Debbie', a 56-day-old dolphin baby is seen from underwater as she swims next to her mother 'Delphi' at the zoo in Duisburg, Germany February 17, 2016. 'Debbie' was born on Christmas Eve and was presented to the public at Duisburg's zoo on Wednesday. REUTERS/Wolfgang Rattay TPX IMAGES OF THE DAY

'Debbie', a 56-day-old dolfin baby is seen from underwater as she swims next to her mother 'Delphi' at the zoo in Duisburg, Germany February 17, 2016. "Debbie" was born on Christmas Eve and was presented to the public at Duisburg's zoo on Wednesday. REUTERS/Wolfgang Rattay TPX IMAGES OF THE DAY

'Debbie', a 56-day-old dolphin baby is seen from underwater as she swims next to her mother 'Delphi' at the zoo in Duisburg, Germany February 17, 2016. 'Debbie' was born on Christmas Eve and was presented to the public at Duisburg's zoo on Wednesday. REUTERS/Wolfgang Rattay TPX IMAGES OF THE DAY

A jellyfish is seen at the aquarium La Rochelle, France, February 12, 2016. REUTERS/Regis Duvignau 

Children look at Humboldt penguins swim in their pool during the stock take at London Zoo in London, Britain January 4, 2016. REUTERS/Stefan Wermuth 

A zoo worker counts Humboldt penguins during a photocall at London Zoo in London, Britain January 4, 2016. REUTERS/Stefan Wermuth 

Humboldt penguins swim in their pool during the stock take at London Zoo in London, Britain January 4, 2016. REUTERS/Stefan Wermuth