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Several pink anemones cluster on top of a coral outcropping providing homes for several anemone fish, Maldives.

Antarctic tern (Sterna vittata), feeding in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Views of the wreck of the Guvernoren, a 20th century whale processing ship, in the Enterprise Islands, Antarctica, Polar Regions

Southern right whale (Eubalaena australis) adult female flukes-up to catch the wind in Puerto Pyramides, Argentina, South America

A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions

Curious crabeater seals (Lobodon carcinophaga), swimming near iceberg at Booth Island near the Antarctic Peninsula, Polar Regions

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

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

Sally lightfoot crab (Grapsus grapsus) in the littoral of the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Antarctic fur seal pups (Arctocephalus gazella) mock-fighting on South Georgia, Southern Ocean, 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 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 technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.

An adult American Eel (Anguilla rostrata) prowls along the edge of the Morrison Springs cavern at 85 feet deep watching over the adolescent eels in the clear freshwaters of the state park near Red Bay, Florida.

A school of orange basslets (Pseudanthias squamipinnis) on a healthy Fijian reef full of hard and soft corals, Fiji.

A large group of purple tube sponge sits high on the reef, Bonaire, Caribbean Netherlands.The Hilma Hooker Shipwreck is visible in the background.

Diver looks on at sponges, pink soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

Diver looks on at sponges, soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Kofah (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. A crater wall separates Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Two scuba divers in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Bigeye Trevally (Caranx sexfasciatus), schooling in Cabo Pulmo National Marine Park, Baja California Sur, Mexico, North America

Soft and hard corals make a coral bommie surrounded by anthias and other small reef fish, Raja Ampat, Indonesia.

Southern right whale (Eubalaena australis) calf surfacing near Puerto Pyramides, Golfo Nuevo, Peninsula Valdez, Argentina

A pod of Pacific white-sided dolphins (Lagenorhynchus obliquidens) leaping and surfacing in Johnstone Strait, British Columbia, Canada, North America

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Horse-eye jacks (Caranx latus), schooling in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize