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A crown-of-thorns starfish in the Marianas Islands.
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Mystery Photo: Prickly Puzzler on the Reef

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A screenshot from the video of colorful corals.
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Slow Life: Time-Lapse on the Coral Reef

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The sea star Odontaster validus and sea urchin Sterechinus neumayeri are often found living in association with one another along the Antarctic coastline, here during the Census of Marine Life.
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Sea Stars, Urchins, and Relatives

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A screenshot from the video of Nancy Knowlton on PBS NewsHour.
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Where did Half of the Great Barrier Reef's Coral Go?

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On coral reefs fish are important links in the food chain that sustains higher-order predators (including humans) and keeps everything in balance.
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Black Axil Chromis on a Coral Reef

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“Upon returning from the reef after a night dive, I swam toward a bright reflection and came eye-to-eye with this beautiful, curious squid.” -- Nature's Best photographer Charles Viggers.Equipment Used to Capture the Shot: Nikon D700; 105mm ƒ/2.8 lens
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Squid at Sunset Reef Grand Cayman, Cayman Islands

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A rendering of an underwater marine scene depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
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Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago)

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A remotely operated vehicle (ROV) recovers a volcano monitor from an underwater observatory.
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ROV Recovers Volcano Monitor

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Lindsay Aylesworth is a PADI dive instructor, marine biology consultant and PhD student with Project Seahorse at the University of British Columbia. Lindsay has carried out monitoring and survey work in the tropical marine environment for ten years, starti
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Lindsay Aylesworth

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EPA divers from Atlanta place this instrument in Charleston Harbor in order to monitor currents and better predict sand movement for a harbor deepening project.
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Measuring Underwater Currents

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