A wheel is seen at the bottom of the sea off the island of Sifnos, Greece, August 18, 2018. Picture taken August 18, 2018. REUTERS/Stelios Misinas 

A glass bottle is seen at the bottom of the sea off the island of Sifnos, Greece, August 18, 2018. Picture taken August 18, 2018. REUTERS/Stelios Misinas 

A fish swims by an anchor at the bottom of the sea off the island of Sifnos, Greece, August 16, 2018. Picture taken August 16, 2018. REUTERS/Stelios Misinas 

A tin container is seen at the bottom of the sea off the island of Thasos, Greece, August 29, 2018. Picture taken August 29, 2018. REUTERS/Stelios Misinas 

A wheel is seen at the bottom of the sea off the island of Thasos, Greece, August 29, 2018. Picture taken August 29, 2018. REUTERS/Stelios Misinas 

Two chairs are seen at the bottom of the sea off the island of Thasos, Greece, August 29, 2018. Picture taken August 29, 2018. REUTERS/Stelios Misinas 

Two chairs are seen at the bottom of the sea off the island of Thasos, Greece, August 29, 2018. Picture taken August 29, 2018. REUTERS/Stelios Misinas 

Metal waste is seen at the bottom of the sea off the island of Thasos, Greece, August 29, 2018. Picture taken August 29, 2018. REUTERS/Stelios Misinas 

An anchor and other metal waste are seen at the bottom of the sea off the island of Thasos, Greece, August 29, 2018. Picture taken August 29, 2018. REUTERS/Stelios Misinas 

An alligator named Muja is seen in its enclosure in Belgrade's Zoo, Serbia, August 14, 2018. Muja is officially the oldest American alligator in the world living in captivity. He was brought to Belgrade from Germany in 1937, a year after the opening of the Zoo. Muja survived three bombings of Belgrade, the Second World War and all hardships the Zoo went through. REUTERS/Marko Djurica TPX IMAGES OF THE DAY 

A seahorse rests on the seabed during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse rests on the seabed during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse is wrapped on a diver's finger during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse rests on the seabed during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse rests on the seabed during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

A seahorse is wrapped on a diver's finger during a dive in the village of Stratoni near Chalkidiki, Greece, July 16, 2018. Picture taken July 16, 2018. REUTERS/Idyli Tsakiri 

Garra rufa obtusas, also known as "doctor fish", swim around the face of a man as he relaxes in a hot spa pool in Kangal, south of the central Anatolian city of Sivas, Turkey, March 27, 2018. REUTERS/Umit Bektas TPX IMAGES OF THE DAY 

A grey mullet is shown next to microplastic found in Hong Kong waters during a Greenpeace news conference in Hong Kong, China, April 23, 2018. REUTERS/Bobby Yip TPX IMAGES OF THE DAY 

A sign is displayed on an artificial island with an entrance to an undersea tunnel, at a section of the Hong Kong-Zhuhai-Macau Bridge, to be opened in Zhuhai, China March 28, 2018. REUTERS/Bobby Yip 

A sign is displayed on an artificial island with an entrance to an undersea tunnel, at a section of the Hong Kong-Zhuhai-Macau Bridge, to be opened in Zhuhai, China March 28, 2018. REUTERS/Bobby Yip 

A car is seen stranded at a car park area as rising sea water hits Muara Baru fishing port during high tide in Jakarta, Indonesia, December 6, 2017. REUTERS/Beawiharta SEARCH "COASTLINE INDONESIA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

An electric pole is seen in the middle of land that has been surrounded by sea water at Pantai Mekar village in Bekasi, West Java province, Indonesia, January 22, 2018. REUTERS/Beawiharta SEARCH "COASTLINE INDONESIA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Water covers downtown streets after the Ohio River flooded in Louisville, Kentucky, U.S., February 26, 2018. REUTERS/John Sommers II TPX IMAGES OF THE DAY 

Water covers downtown streets after the Ohio River flooded in Louisville, Kentucky, U.S., February 26, 2018. REUTERS/John Sommers II 

Water covers downtown streets after the Ohio River flooded in Louisville, Kentucky, U.S., February 26, 2018. REUTERS/John Sommers II 

A car is submerged in water that covers the off ramp of interstate 71 along the Ohio River after it flooded Louisville, Kentucky, U.S., February 26, 2018. REUTERS/ John Sommers II 

Members of Akbayan Party List activist group wear goggles and chant slogans during a protest about China's naming of undersea features in Benham Rise in the disputed South China Sea, outside the Department of Foreign Affairs in Manila, Philippines February 20, 2018. REUTERS/Erik De Castro TPX IMAGES OF THE DAY 

Members of Akbayan Party List activist group wear goggles and display placards during a protest about China's naming of undersea features in Benham Rise in the disputed South China Sea, outside the Department of Foreign Affairs in Manila, Philippines February 20, 2018. REUTERS/Erik De Castro 

A member of Akbayan Party List activist group wears goggles and displays a miniature Philippine flag during a protest about China's naming of undersea features in Benham Rise in the disputed South China Sea, outside the Department of Foreign Affairs in Manila, Philippines February 20, 2018. REUTERS/Erik De Castro 

Members of Akbayan Party List activist group wear goggles and chant slogans during a protest about China's naming of undersea features in Benham Rise in the disputed South China Sea, outside the Department of Foreign Affairs in Manila, Philippines February 20, 2018. REUTERS/Erik De Castro 

A Christmas tree next to a tree is seen on the flooded banks of the River Seine in Paris, France, after days of almost non-stop rain caused flooding in the country, January 27, 2018. REUTERS/Pascal Rossignol 

General view of the Seine River that overflows its banks as heavy rains throughout the country have caused flooding, in Paris, France, January 26, 2018. REUTERS/Sandra Auger 

A street lamp and a tree are seen on the flooded banks of the River Seine in Paris, France, after days of almost non-stop rain caused flooding in the country, January 26, 2018. REUTERS/Christian Hartmann 

General view of the Seine River that overflows its banks as heavy rains throughout the country have caused flooding, in Paris, France, January 26, 2018. REUTERS/Sandra Auger 

A dog is seen at the entrance of a house in the flooded residential area of Villeneuve-Saint-Georges, near Paris, France January 26, 2018. REUTERS/Christian Hartmann 

A general view shows the Notre Dame Cathedral at night, on the flooded banks of the River Seine in Paris, France, after days of almost non-stop rain caused flooding in the country, January 25, 2018. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY 

A street-lamp and a tree are seen on the flooded banks of the River Seine in Paris, France, after days of almost non-stop rain caused flooding in the country, January 25, 2018. REUTERS/Christian Hartmann 

A general view shows the Notre Dame Cathedral at night, on the flooded banks of the River Seine in Paris, France, after days of almost non-stop rain caused flooding in the country, January 25, 2018. REUTERS/Christian Hartmann 

A street-lamp is seen on the flooded banks of the Seine River in Paris, France, after days of almost non-stop rain caused flooding in the country, January 24, 2018. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY 

A pig wades through a flooded patio after heavy rains caused the river Paraguay to overflow, on the outskirts of Asuncion, Paraguay January 23, 2018. REUTERS/Jorge Adorno 

A pig wades out on to a flooded street after heavy rains caused the river Paraguay to overflow, on the outskirts of Asuncion, Paraguay January 23, 2018. REUTERS/Jorge Adorno 

A bed stands in a flooded home after heavy rains caused the river Paraguay to overflow, on the outskirts of Asuncion, Paraguay January 23, 2018. REUTERS/Jorge Adorno 

A flooded house is seen after heavy rains caused the river Paraguay to overflow, on the outskirts of Asuncion, Paraguay January 23, 2018. REUTERS/Jorge Adorno 

A boy stands on a fence near a flooded home after heavy rains caused the river Paraguay to overflow, on the outskirts of Asuncion, Paraguay January 23, 2018. REUTERS/Jorge Adorno 

A view shows the flooded banks of the Seine River after days of rainy weather in Paris, France January 23, 2018. REUTERS/Gonzalo Fuentes TPX IMAGES OF THE DAY 

A view shows the Pont Alexandre III bridge and flooded banks of the Seine River after days of rainy weather in Paris, France January 23, 2018. REUTERS/Gonzalo Fuentes 

A view shows the flooded banks of the Seine River after days of rainy weather in Paris, France January 23, 2018. REUTERS/Gonzalo Fuentes 

Two Leopard Sharks are pictured during the annual inventory in Hagenbecks zoo in Hamburg, Germany January 12, 2018. REUTERS/Morris Mac Matzen 

An abandoned car is seen stuck in flooded water on the 101 freeway after a mudslide in Montecito, California, U.S. January 10, 2018. REUTERS/Alan Devall 

Flooded houses are seen following heavy rains in Rafah in the southern Gaza Strip January 6, 2018. REUTERS/Ibraheem Abu Mustafa 

The street sign for the Moselle street is flooded by the river Moselle in Reil, Germany, January 5, 2018. REUTERS/Wolfgang Rattay 

The street sign for the Moselle street is flooded by the river Moselle in Reil, Germany, January 5, 2018. REUTERS/Wolfgang Rattay 

The street sign for the Moselle street is flooded by the river Moselle in Reil, Germany, January 5, 2018. REUTERS/Wolfgang Rattay 

Houses are reflected in the waters of the river Moselle after the river flooded the street in front of this residential area of Bernkastell-Kues, Germany, January 5, 2018. REUTERS/Wolfgang Rattay 

A swan swims over a parking lot flooded by the river Moselle in Bernkastell-Kues, Germany, January 5, 2018. REUTERS/Wolfgang Rattay 

A swan stands on a street flooded by the river Moselle in Bernkastell-Kues, Germany, January 5, 2018. REUTERS/Wolfgang Rattay 

A traffic sign for the nearby ferry is flooded by the river Rhine, in Linz, Germany January 5, 2018. REUTERS/Wolfgang Rattay 

Drivers make their way along the flooded Beach Road after the ocean overtopped the seawall during a winter snowstorm in the Boston suburb of Lynn, Massachusetts, U.S., January 4, 2018. REUTERS/Brian Snyder 

A sunken boat is seen half submerged after Storm Eleanor in Galway Bay, Ireland, January 3, 2018. REUTERS/Clodagh Kilcoyne 

A sunken boat is seen half submerged after Storm Eleanor in Galway Bay, Ireland, January 3, 2018. REUTERS/Clodagh Kilcoyne