Martin Mohrmann, a marine researcher with the Voice of the Ocean foundation, reviews data about methane levels in the Baltic Sea, collected with remote-controlled submersibles, in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Martin Mohrmann, a marine researcher with the Voice of the Ocean foundation, reviews data about methane levels in the Baltic Sea, collected with remote-controlled submersibles, in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Remote-controlled submersibles known as 'gliders', used for oceanographic research, lie arranged on the floor of the Voice of the Ocean foundation's office in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Remote-controlled submersibles known as 'gliders', used for oceanographic research, lie arranged on the floor of the Voice of the Ocean foundation's office in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Gothenburg University oceanographer Bastien Queste, holds a sensor that was attached to a remote-controlled submersible to monitor methane levels in the Baltic Sea, during an interview in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Gothenburg University oceanographer Bastien Queste and Voice of the Ocean foundation's oceanographic technician Marcus Melin look at remote-controlled submersibles called 'gliders' in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Gothenburg University oceanographer Bastien Queste and Voice of the Ocean foundation's oceanographic technician Marcus Melin look at remote-controlled submersibles called 'gliders' in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Remote-controlled submersibles known as 'gliders', used for oceanographic research, lie arranged on the floor of the Voice of the Ocean foundation's office in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Gothenburg University oceanographer Bastien Queste, holding a sensor that was attached to a remote-controlled submersible to monitor methane levels in the Baltic Sea, talks during an interview in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Gothenburg University oceanographer Bastien Queste and Voice of the Ocean foundation's oceanographic technician Marcus Melin look at remote-controlled submersibles called 'gliders' in Gothenburg, Sweden, March 24, 2023. REUTERS/Tom Little 

Semi-submersible maritime vessels that, according to the authorities, are used to transport cocaine and its manufacture is financed by Mexican cartels, and which were seized by the Colombian Navy, are seen in the Marine Infantry Battalion (BAFLIM), in Tumaco, Colombia December 15, 2021. Picture taken December 15, 2021. To match Insight COLOMBIA-DRUGS/MEXICO-COCA REUTERS/Luisa Gonzalez 

Semi-submersible maritime vessels that, according to the authorities, are used to transport cocaine and their manufacture is financed by Mexican cartels, and which were seized by the Colombian Navy, are seen in the Marine Infantry Battalion (BAFLIM), in Tumaco, Colombia December 15, 2021. Picture taken December 15, 2021. To match Insight COLOMBIA-DRUGS/MEXICO-COCA REUTERS/Luisa Gonzalez 

A semi-submersible maritime vessel that, according to the authorities, is used to transport cocaine and its manufacture is financed by Mexican cartels, and which was seized by the Colombian Navy, is seen near the pier of the Marine Infantry Battalion (BAFLIM), in Tumaco, Colombia December 14, 2021. Picture taken December 14, 2021. To match Insight COLOMBIA-DRUGS/MEXICO-COCA REUTERS/Luisa Gonzalez 

A sign is submersed on a road flooded by the Chamelecon River due to heavy rain caused by Storm Iota, in La Lima, Honduras November 19, 2020. REUTERS/Jorge Cabrera 

Swans are seen with a submerged bike in a river in Witney, as the spread of the coronavirus disease (COVID-19) continues, Witney, Britain, April 20, 2020. REUTERS/Eddie Keogh TPX IMAGES OF THE DAY 

A swan is seen with a submerged bike in a river in Witney, as the spread of the coronavirus disease (COVID-19) continues, Witney, Britain, April 20, 2020. REUTERS/Eddie Keogh 

A general view shows a rainbow in a flooded area, over the border between Israel and Egypt, near the Israeli southern village of Beer Milka, Israel March 13, 2020 REUTERS/ Amir Cohen 

A car is seen during a thunderstorm and heavy rains in downtown of Cairo, as the government announced a day off while the rain exceeds the infrastructure's capacity in most cities, in Egypt March 12, 2020. REUTERS/Mohamed Abd El Ghany 

A man views flooded properties beside the River Severn in Ironbridge, Britain, February 27, 2020. REUTERS/Toby Melville 

A tree is seen partially submerged in water after a riverbank collapsed in Ta Dar U village, Bago, Myanmar, February 5, 2020. Photo taken on February 5, 2020. REUTERS/Ann Wang 

Demolished part of Hasankeyf village and a wall constructed as part of the Ilisu Dam project are seen in southeastern Batman province, Turkey, February 20, 2020. Picture taken February 20, 2020. REUTERS/Murad Sezer 

A bridge over the Tigris River which connects Hasankeyf to the other side of the river is seen nearly submerged by the waters of Ilisu Dam in Turkey, February 20, 2020. Picture taken February 20, 2020. REUTERS/Murad Sezer 

An old cemetery is seen in Hasankeyf, which will be significantly submerged by the Ilisu Dam, with new Hasankeyf in the background in southeastern Batman province, Turkey, February 20, 2020. Picture taken February 20, 2020. REUTERS/Murad Sezer 

An old pillbox stands half-submerged in sand in front of oyster farms in Yunlin, Taiwan, January 6, 2020. REUTERS/Ann Wang SEARCH "TAIWAN BUNKER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Cattle killed by the bushfires are buried in Cobargo, New South Wales, Australia January 5, 2020. REUTERS/Tracey Nearmy TPX IMAGES OF THE DAY 

A swan paddles on Loch Faskally, Pitlochry, Scotland, Britain October 26, 2019. REUTERS/Russell Cheyne 

A Pillar coral (Dendrogyra cylindricus) showing a small amount of tissue loss caused by Stony Coral Tissue Loss Disease (SCTLD) stands near the University of the Virgin Islands campus in St Thomas in the U.S. Virgin Islands, May 17, 2019. REUTERS/Lucas Jackson 

Fatima, a two-year-old hippopotamus rescued from a circus, swims at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

Fatima, a two-year-old hippopotamus rescued from a circus, opens its mouth at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

Fatima, a two-year-old hippopotamus rescued from a circus, swims at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

Fatima, a two-year-old hippopotamus rescued from a circus, is fed at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

Fatima, a two-year-old hippopotamus rescued from a circus, shakes its head at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas 

A man paddles in the waters of the Ionian Sea near Sidari settlement on the island of Corfu, Greece July 26, 2019. REUTERS/Vasily Fedosenko 

Large crocodiles are seen in the Tarcoles River, a river with one of the highest crocodile population in the world, in Tarcoles, province of Puntarenas, Costa Rica, July 16, 2019. REUTERS/Juan Carlos Ulate 

A large crocodile is seen in the Tarcoles River, a river with one of the highest crocodile population in the world, in Tarcoles, province of Puntarenas, Costa Rica, July 16, 2019. REUTERS/Juan Carlos Ulate 

A large crocodile eats a chicken given by Juan Cerdas, whose hobby is feeding them at the Tarcoles River, a river with one of the highest crocodile population in the world, in Tarcoles, province of Puntarenas, Costa Rica, July 16, 2019. REUTERS/Juan Carlos Ulate 

A large crocodile is seen in the Tarcoles River, a river with one of the highest crocodile population in the world, in Tarcoles, province of Puntarenas, Costa Rica, July 16, 2019. REUTERS/Juan Carlos Ulate 

A large crocodile is seen in the Tarcoles River, a river with one of the highest crocodile population in the world, in Tarcoles, province of Puntarenas, Costa Rica, July 16, 2019. REUTERS/Juan Carlos Ulate 

A mourner touches a photograph at the grave of Captain third rank Vladimir Sukhinichev during the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, at Serafimovskoye cemetery in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

A man attends the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, at Serafimovskoye cemetery in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

People attend the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, at Serafimovskoye cemetery in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

People attend the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, at Serafimovskoye cemetery in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

People attend the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, at Serafimovskoye cemetery in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

A view shows a motorcade outside Serafimovskoye cemetery during the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

A view shows a motorcade outside Serafimovskoye cemetery during the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

Men gather at Serafimovskoye cemetery before the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

Law enforcement officers stand guard at Serafimovskoye cemetery before the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

Minibuses transporting coffins drive outside Serafimovskoye cemetery before the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

Minibuses transporting coffins drive into Serafimovskoye cemetery before the funeral of Russian sailors, who were recently killed in a fire on a secret nuclear research submarine in the area of the Barents Sea, in Saint Petersburg, Russia July 6, 2019. REUTERS/Anton Vaganov 

Russian servicemen attend a memorial service for sailors killed in a Russian submarine, which caught fire in the area of the Barents Sea, at the Naval Cathedral of Saint Nicholas in Kronstadt, Russia July 4, 2019. REUTERS/Anton Vaganov 

Russian servicemen attend a memorial service for sailors killed in a Russian submarine, which caught fire in the area of the Barents Sea, at the Naval Cathedral of Saint Nicholas in Kronstadt, Russia July 4, 2019. REUTERS/Anton Vaganov 

People attend a memorial service for sailors killed in a Russian submarine, which caught fire in the area of the Barents Sea, at the Naval Cathedral of Saint Nicholas in Kronstadt, Russia July 4, 2019. REUTERS/Anton Vaganov 

Russian servicemen attend a memorial service for sailors killed in a Russian submarine, which caught fire in the area of the Barents Sea, at the Naval Cathedral of Saint Nicholas in Kronstadt, Russia July 4, 2019. REUTERS/Anton Vaganov 

A baby hippo stands in water near its mother Mona at Dvur Kralove Zoo, Czech Republic, June 12, 2019. Picture taken June 12, 2019. REUTERS/David W Cerny 

A baby hippo stands in water at Dvur Kralove Zoo, Czech Republic, June 12, 2019. Picture taken June 12, 2019. REUTERS/David W Cerny 

A baby hippo swims in a pond at Dvur Kralove Zoo, Czech Republic, June 12, 2019. Picture taken June 12, 2019. REUTERS/David W Cerny 

A baby hippo swims in a pond near its mother Mona at Dvur Kralove Zoo, Czech Republic, June 12, 2019. Picture taken June 12, 2019. REUTERS/David W Cerny 

Members of the media tour operate deck of the Heerema Marine Contractors' Sleipnir, the world's largest semi-submersible crane vessel, at the Sembcorp Marine shipyard in Singapore, May 23, 2019. REUTERS/Edgar Su 

Members of the media tour are seen on the helipad of Heerema Marine Contractors' Sleipnir, the world’s largest semi-submersible crane vessel, at the Sembcorp Marine shipyard in Singapore, May 23, 2019. REUTERS/Edgar Su 

Members of the media tour the helipad of Heerema Marine Contractors' Sleipnir, the world's largest semi-submersible crane vessel, at the Sembcorp Marine shipyard in Singapore, May 23, 2019. REUTERS/Edgar Su