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A pajama nudibranch (Chromodoris quadricolor) attempts to climb up the side of a sea cucumber, Philippines, Southeast Asia, Asia

These striped catfish (Plotosus lineatus) have a venomous spine in front of their pectoral fin, Philippines, Southeast Asia, Asia

Mantle detail on a spondylus (Thorny Oyster shell) (Spondylus varians), Philippines, Southeast Asia, Asia

Three squat anemone shrimp (Thor amboinensis), at the base of a tube anemone, Philippines, Southeast Asia, Asia

Bubble coral shrimp (Vir philippinensis) on bubble coral (Plerogyra sp.), Philippines, Southeast Asia, Asia

A blackspotted puffer (Arothron nigropunctatus) curled up on the reef for the night, Philippines, Southeast Asia, Asia

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 beautiful coral reef grows near a set of limestone islands 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.

A Japanese Jake seaplane, shot down during World War II, lies on the seafloor of Palau's lagoon. Many planes and dozens of large ships were sunk around Palau during the war.

Coral polyps (Galaxea sp.) wait for plankton 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 rare roughsnout ghost pipefish (Solenostomus paegnius) hovers above the seafloor in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A live sundial shell (Architectonica perspectiva) crawls across the seafloor in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

A colorful and healthy coral reef thrives in shallow water in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A beautiful Blue Velvet Head Shield sea slug (Chelidonura varians) crawls across a sandy seafloor near Alor in the Lesser Sunda Islands of Indonesia.

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

A well-camouflaged tasseled wobbegong shark (Eucrossorhinus dasypogon) lies on the sandy seafloor of Raja Ampat, Indonesia.

A cluster of colorful tunicates grow on a coral reef amid the remote, tropical islands of Raja Ampat, Indonesia.

Colorful chocolate chip starfish lie scattered on the floor of a seagrass meadow 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 coral reef thrives 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 bleached magnificent sea anemone is found on a reef off the coast of Sulawesi in Indonesia. Bleaching is usually associated with higher than normal sea temperatures.

A well-camouflaged tasselled wobbegong, Eucrossorhinus dasypogon, lies on the seafloor in Raja Ampat, Indonesia.

A spotted porcelain crab, Neopetrolisthes maculatus, snuggles into its host anemone in Komodo National Park, Indonesia.

A slightly bleached staghorn coral colony grows in shallow water in the Solomon Islands. This Melanesian region is known for its spectacular 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.

A thorny seahorse (Hippocampus histrix) uses effective camouflage to blend into its surroundings on the seafloor of Lembeh Strait, Indonesia.

A Japanese Jake seaplane, shot down during World War II, lies on the seafloor of Palau's lagoon. Many planes and dozens of large ships were sunk around Palau during the war.

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 pair of robust ghost pipefish (Solenostomus cyanopterus) hover above the seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

Detail of the colorful dorsal fin of a scorpionfish (Scorpaenopsis sp.) in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A beautiful nudibranch (Hypselodoris tryoni) crawls along the seafloor near Alor in the Lesser Sunda Islands of Indonesia.

A pair of beautiful nudibranchs (Hypselodoris tryoni) crawl along the seafloor 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.

Detail of a mushroom coral (Fungia sp.) on a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its 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.

Detail of a feather duster worm growing on a coral reef near Alor in the Lesser Sunda Islands of Indonesia.

A well-camouflaged tasseled wobbegong shark (Eucrossorhinus dasypogon) lies on the sandy seafloor of Raja Ampat, Indonesia.

Detail of the colorful tentacles on a bulbed anemone, Entacmaea quadricolor, growing on a reef near Alor in Indonesia.

A pair of Chromodoris annae nudibranch crawl on a large tunicate among the remote, tropical islands of Raja Ampat, Indonesia.

A vibrant nudibranch, Phyllidia sp., feeds on sponges on a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.

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

A well-camouflaged reef stonefish, Synanceia verrucosa, waits to ambush prey in Raja Ampat, Indonesia.

Discarded plastic bags and other trash float above a shallow coral reef in Raja Ampat, Indonesia. Plastics have become a major pollution problem worldwide.

A beautiful coral reef thrives 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 hawksbill sea turtle, Eretmochelys imbricata, lays on 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 juvenile painted spiny lobster, Panulirus versicolor, inhabits a crevice on a reef amid the tropical islands of Raja Ampat, Indonesia.

Detail of a bulbed anemone, Entacmaea quadricolor, on a coral reef in Komodo National Park, Indonesia.

Diver looks on at sponges, coral and crinoids in a colorful Komodo seascape, taken at Cannibal Rock, Horseshoe Bay, Komodo National Park, Indonesia.

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.

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 pair of colorful tunicates grows on a reef in Lembeh Strait, Indonesia. This is a filter-feeding organism.

A Clark's anemonefish (Amphiprion clarkii) snuggles amongst its host's tentacles on a reef in Lembeh Strait, Indonesia.

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.

Beautiful soft coral colonies grow on a healthy coral reef in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

A diverse array of corals grow in Raja Ampat, Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

A Clark's anemonefish (Amphiprion clarkii) snuggles amongst its host's tentacles on a reef in Lembeh Strait, Indonesia.

Vibrant soft coral colonies grow on a reef dropoff in Lembeh Strait, Indonesia. This area is known for its 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 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 Clark's anemonefish (Amphiprion clarkii) snuggles into the tentacles of its host anemone in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A venomous stonefish (Synanceia verrucosa) camouflages itself in sand in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Detail of a large coral polyp in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Abstract of a mushroom coral (Fungia sp.) growing on a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A Black-finned snake eel (Ophichthus cephalozona) pokes its head out of a sandy seafloor in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Detail of a stony coral (Galaxea sp.) growing in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

Colony of tunicates grow on a reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

Colorful tunicates and soft corals grow on a reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

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.

Detail of the texture on a mushroom coral (Fungia sp.) growing in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A small red starfish clings to coralline algae in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A shallow coral reef thrives in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A large mantis shrimp (Lysosquilla sp.) uses its excellent eyesight to scan its underwater environment in the Lesser Sunda Islands of Indonesia.

A predatory lizardfish is finishing off a meal of a blenny 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.

A female ribbon eel (Rhinomuraena quaesita) yawns as it lives on a sandy slope near Alor in the Lesser Sunda Islands of Indonesia.

An ornate ghost pipefish (Solenostomus paradoxus) hovers above a coral reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.