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Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Underwater photo taken during the Hol Chan Marine Reserve, Shark Ray Alley and Coral Garden Snorkelling Tour, Belize District, Belize

Captive giant arapaima, Arapaima gigas, underwater at the Dallas Rescue Center in Iquitos, Amazon, Peru.

Black Sea Nettle, type of jelly fish, Monterey Aquarium, Monterey, California, United States of America, North America

An adult specklefin grouper ( Epinephelus ongus, off Port Airboret, Raja Ampat, Indonesia, Southeast Asia, Asia

Fragile, foliose corals grow on a beautiful reef slope in Raja Ampat, Indonesia. This remote, equatorial region is known as the heart of the Coral Triangle. It is a popular destination for scuba divers and snorkelers.

False clownfish (Amphiprion ocellaris) swim near their host anemone in Alor, Indonesia. This remote region is known for its beautiful reefs and spectacular marine biodiversity.

Forest-covered limestone islands surround a gorgeous lagoon in a remote part of Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.

A spotted eagle ray (Aetobatus narinari) swims over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

A bulbed anemone (Entacmaea quadricolor) grows on a reef in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A tube anemone grows on a sandy seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A yellow stingray (Urobatis jamaicensis) lays on the sandy seafloor of Turneffe Atoll in Belize. This small and beautiful elasmobranch ranges throughout the Caribbean Sea.

A pair of beautiful nudibranchs (Hypselodoris tryoni) crawl along the seafloor near Alor in the Lesser Sunda Islands of Indonesia.

Detail of a colorful giant clam (Tridacna maxima) growing on a reef near Alor in the Lesser Sunda Islands of Indonesia.

Detail of a coral colony in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

A broadclub cuttlefish (Sepia latimanus) uses camouflage to blend into a shallow coral reef in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

An unidentified moray eel (Gymnothorax sp.) swims over a sandy seafloor in Komodo National Park, Indonesia.

A warty frogfish (Antennarius maculatus) is well-camouflaged as it waits to ambush prey on a reef in Komodo National Park, Indonesia.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim above a healthy reef in the Lesser Sunda Islands of Indonesia.

A traditional fish trap, made out of bamboo, captures small reef fish near Alor in the Lesser Sunda Islands of Indonesia.

A snowflake moray eel (Echidna nebulosa) peeks out from a dark hole on a reef in Komodo National Park, Indonesia.

Soft corals grow on the edge of a beautiful reef in the historic Banda Islands of eastern Indonesia.

Colorful tunicates, sponges, hydroids, and other invertebrates grow on a reef in Raja Ampat, Indonesia.

A small, unidentified scorpionfish hides in a shallow seagrass meadow in the Banda Islands of eastern Indonesia.

Vibrant tunicates, sponges, hydroids, and echinoderms grow on a coral reef among the remote, tropical islands of Raja Ampat, Indonesia.

A large roughtail stingray, Dasyatis centroura, lays on the seagrass-covered seafloor of Turneffe Atoll off the coast of Belize. This reef is part of the massive Mesoamerican Reef System in the Caribbean Sea, the second largest barrier reef on Earth.

A beautiful soft coral colony, Dendronephthya sp., grows amid the remote, tropical islands of Raja Ampat, Indonesia.

A small, colorful goby sits on a coral colony amid the remote, tropical islands of Raja Ampat, Indonesia.

A false clownfish, Amphiprion ocellaris, swims among the tentacles of its host anemone in Raja Ampat, Indonesia.

Beautiful coral polyps grow close together in a vibrant colony amid the tropical islands of Raja Ampat, Indonesia.

A beautiful nudibranch, Chromodoris coi, crawls across the seafloor in Komodo National Park, Indonesia.

A colorful warty frogfish, Antennarius maculatus, yawns as it waits for prey to swim close by in Komodo National Park, Indonesia.

A black manta ray, Mobula alfredi, visits a cleaning station on a reef in Komodo National Park, Indonesia.

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

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

A large school of bigeye trevally (Caranx sexfasciatus) in deep water near Cabo Pulmo, Baja California Sur, Mexico, North America

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

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

Adult female killer whale (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

Adult female killer whale (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

A young killer whale (Orcinus orca) surfacing in Glacier Bay National Park, Southeast Alaska, United States of America, Pacific Ocean, North America

A view of a nuclear powered submarine in the industrial and militarized Russian seaport city of Murmansk, Murmansk Oblast, Russia, Arctic, Europe

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