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A rendering of an ocean scene as it may have looked 65 million years ago, when an astroid fell to Earth and triggered a mass extinction event.
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Cretaceous-Paleogene Boundary (65 Million Years Ago)

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This close-up view of salps, which have aggregated together into a long chain, have brilliant red guts from eating red plankton.
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Close-up View of Salps

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The fins of the frogfish are perfect for creeping around in the algae and stalking unsuspecting prey.
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Frogfish Histrio histrio

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The Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems site in France was inscribed on the World Heritage List in 2008. The site features an exceptional diversity of coral and fish species and a continuum of habitats from mangroves to se
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Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems, France

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A diagram of a shark's six highly refined senses: smell, hearing, touch, taste, sight, and electromagnetism
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Shark Senses

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X-ray image of a slender snipe eel
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X-Ray Image of a Slender Snipe Eel

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Smithsonian Zoologist Dr. Clyde Roper in front of the museum's stored cephalopod collection.
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Smithsonian Cephalopod Collection

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The Havre volcano lies three thousand feet (900 meters) beneath the sea surface.
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The Mystery of an Underwater Volcano

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Eugenie Clark collecting specimens on a dive.
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Eugenie Clark - The Shark Lady

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This species of bamboo coral, discovered in 2004 in the Pacific Northwest, has unusually long and impressive tentacles.
Slideshow

Newly Discovered Deep-Sea Corals

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a small spikey crab sits on a black background
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Tiny Crab Gains a Big Audience

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A dive safety officer keeps a close eye on divers from the surface.
Article

Diving in the Middle of Nowhere

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