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Blacktip reef sharks swim just under the surface in the Solomon Islands. This beautiful Melanesian region is known for its spectacular reefs and high marine biodiversity.

A large reef manta ray (Mobula alfredi) swims through clear water in 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.

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

A hawksbill sea turtle swims over a coral reef in Palau. This is an endangered species often hunted for its shell and meat.

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.

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

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 shortfin lionfish (Dendrochirus brachypterus) lays on the seafloor waiting for prey to swim near in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A spine-cheeked anemonefish (Premnas biaculeatus) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia.

A lionfish (Pterois volitans) swims along the edge of a beautiful reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A massive school of bigeye trevally (Caranx sexfasciatus) swims in deep water near Cocos Island, Costa Rica. This remote island is home to an incredible variety of marine life.

A large black-blotched stingray (Taeniura meyeni) swims in deep water near Cocos Island, Costa Rica. This remote island is home to an incredible variety of marine life.

A pink anemonefish (Amphiprion perideraion) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A banded sea snake (Laticauda colubrina) swims at the surface in Wakatobi National Park, Indonesia. This is one of the most venomous snakes in the world.

A pink anemonefish (Amphiprion perideraion) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A school of juvenile striped eel catfish (Plotosus lineatus) swims over the seafloor in Komodo National Park, Indonesia.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim above a beautiful set of corals growing near Alor in the Lesser Sunda Islands of Indonesia.

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

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim in a strong current near Alor in the Lesser Sunda Islands of Indonesia.

Colorful anthias fish swim above a beautiful reef growing near an island in the Banda Sea, Indonesia. This remote and historic region, known previously for the Spice Islands, harbors extraordinary marine biodiversity.

A large banded sea snake, Laticauda colubrina, sinuously swims over a beautiful reef in Wakatobi National Park, Indonesia.

A pink anemonefish, Amphiprion perideraion, swims above its beautiful host anemone in Wakatobi National Park, Indonesia.

A well-camouflaged yellow stingray, Urobatis jamaicensis, swims over a shallow seagrass meadow growing within Turneffe Atoll's lagoon in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth

Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

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

A school of lined sweetlips, Plectorhinchus lineatus, swim above a healthy coral reef in Raja Ampat, Indonesia.

A hawksbill sea turtle, Eretmochelys imbricata, swims over a beautiful reef in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

A beautiful nudibranch, Bornella anguilla, crawls over black sand in Komodo National Park, Indonesia. This rare nudibranch can swim over short distances quite well.

A thick school of yellow-striped scad swims below a jetty amid the tropical islands of Raja Ampat, Indonesia.

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

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

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

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.

Guadalupe fur seals (Arctocephalus townsendi), underwater on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

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

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

Two women going to swim at Cobo Bay on the west coast of Guernsey Island, Bailiwick of Guernsey, United Kingdom

By-the-wind sailor (Velella velella), floating on the surface of the sea outside Newport Beach, California, United States of America, North America

A school of Bluegill and Sunfish appear to swim toward the light from above over the Morrison Springs cavern dropoff at the state park in northwest 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.

Golden Damselfish (Amblyglyphidodon aureus) and other schooling fish swim around the coral head topped with Elkhorn Coral in the South Pacific ocean near Tavarua Island offshore from Liti Levu, Fiji.

A Blackside Hawkfish (Paracirrhites forsteri) swims over the red tentacles of a sea fan in the warm clear waters off the coast of Likuri Island, Fiji.

A Black Sea Turtle (Chelonia mydas agassizi) with a remora trying to attach, swims through a school of fish in the clear South Pacific ocean near Tavarua Island off the coast of Liti Levu, Fiji.

A Black Sea Turtle (Chelonia mydas agassizi) swims in the clear South Pacific ocean off the coast of Tavarua Island, Fiji in March 2012.

Close-up of a bicolor damselfish (Stegastes partitus) as it swims up from the coral reef off the coast of Key Largo, Florida.

A Hi Utsuri koi fish swims over the rocky bottom of the clear freshwater of Vortex Spring shoreline in Ponce De Leon, Florida.

A large spotted pufferfish swims in for a closer look at the photogrpher's camera off the coast of Key Largo, Florida.

A Gray Angelfish (Pomacanthus arcuatus) swims by diamond and fire corals in the shallow waters of the Atlantic Ocean off the coast of Key Largo, Florida.

A Blue Chromis (Chromis cyanea) swims into the current to maintain station over a colorful reef in the Atlantic Ocean off the coast of Key Largo, Florida.

An underwater photographer swims past a large yellow gorgonian fan with a bed of red soft corals beneath it, Fiji.

The hawksbill sea turtle (Eretmochelys imbricata) swims in the waters off the coast of Bonaire, Caribbean Netherlands. The hawksbill is a critically endangered sea turtle belonging to the family Cheloniidae.

The hawksbill sea turtle (Eretmochelys imbricata) swims in the waters off the coast of Bonaire, Caribbean Netherlands. The hawksbill is a critically endangered sea turtle belonging to the family Cheloniidae.

An oceanic blacktip shark swims by with remora in tow, Aliwal Shoal, Umkomaas, KwaZulu-Natal, South Africa.