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Sea urchins just caught and opened showing the edible cores (uni), Perna inlet, Palmizana, St Clement island, Hell's Islands (Pakleni), Hvar city, Hvar island, Croatia, Southeast Europe

An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America

An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America

Adult Dall's porpoise (Phocoenoides dalli) surfacing with characteristic rooster tail splash in Johnstone Strait, British Columbia, Canada, North America

Humpback whale (Megaptera novaeangliae), surfacing off Half Moon Island in the South Shetland Island Group, Antarctica, Polar Regions

California sea lion (Zalophus californianus), with snorkeler at Los Islotes, Baja California Sur, Mexico, North America

California sea lion (Zalophus californianus), with photographer at Los Islotes, Baja California Sur, Mexico, North America

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

California sea lion (Zalophus californianus), with photographer at Los Islotes, Baja California Sur, Mexico, North America

Schooling king angelfish (Holacanthus passer), underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

California sea lion (Zalophus californianus), with snorkeler at Los Islotes, Baja California Sur, Mexico, North America

Young Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lions (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult gentoo penguin (Pygoscelis papua), porpoising for swimming speed near the Antarctic Peninsula, Southern Ocean, Polar Regions

A myriad of hard and soft corals at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

Wreck of a C-53 Skytrooper, which went down on February 26, 1942 in Vansittart Bay, Kimberley, Western Australia, Australia, Pacific

Clownfish (Amphiprion species) guarding their sea anemone home; on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A Ctenocella species octocoral sea fan, surrounded by an assortment of hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A huge Echinogorgia species sea fan, more than two metres across, on a coral reef in Gaafu Dhaalu atoll, Maldives

Staghorn scleractinic hard corals (Acropora species), on a coral reef in Gaafu Dhaalu atoll, Maldives

A growth of Acropora species, and one Goniastrea species (centre) scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

Mushroon Leather Coral (Sarcophyton species), a soft coral, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A 'forest' of Staghorn (Acropora species) hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A 'forest' of Staghorn (Acropora species) hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

Acropora species scleractinic hard corals, showing some bleaching, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, Maldives

The wreck of the MS Oliva on Nightingale Island, part of the Tristan da Cunha Group, South Atlantic Ocean

Diving and snorkling area, Punta Perdiz near Playa Giron, Bay of Pigs, Matanzas Province, Cuba, West Indies, Caribbean, Central America

Looking down into the Los Peces fresh water cave near Playa Giron, Matanzas Province, Cuba, West Indies, Caribbean, Central America

Adult fin whale (Balaenoptera physalus) surfacing in the rich waters off the continental shelf near South Georgia, Polar Regions

Adult Commerson's dolphin (Cephalorhynchus commersonii), surfacing in Stanley Harbor in the Falkland Islands, South America

Adult Commerson's dolphin (Cephalorhynchus commersonii), surfacing in Stanley Harbor in the Falkland Islands, South America

Cygnet with head underwater, fishing near a rowboat in Thorpness boating lake, Aldeburgh, Suffolk, United Kingdom

Adult Weddell seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, Southern Ocean, Polar Regions

Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

A small pod of killer whales (Orcinus orca) off the west coast of Isabela Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Guest from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Juvenile humpback whale (Megaptera novaeangliae) breaching near the Antarctic Peninsula, Antarctica, Polar Regions

A small pod of Type B killer whales (Orcinus nanus) just outside Duse Bay in the Weddell Sea, Antarctica, Polar Regions

A diver shines a light in on a cavern filled with glassy sweepers (Pempheris schomburgkii) at Molasses Reef in Key Largo, Florida.

A diver has a close encounter with an oceanic whitetip shark (Carcharhinus longimanus) at Cat Island in the Bahamas.

A young married couple celebrate their ten year anniversary by scuba diving in the clear freshwaters of Devil's Den Springs, a sinkhole in Williston, Florida, as the afternoon sun filters down into the cavern.

A scuba diver swims through an underwater field of tape grass leading away from the Blue Springs cave in Merritts Mill Pond in Marianna, Florida.

A scuba diver surfacing and looking up into the light as he ascends from the bottom of Devil's Den, a sinkhole in Williston, Florda.

A technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.

A scuba diver ascends into the light emanating above through the sink hole into the clear freshwaters of Devil's Den cave near Williston, Florida.