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A rockfish finds refuge in a red tree coral, a deep-sea coral in the Olympic Coast National Marine Sanctuary.
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Rockfish Sheltering in Coral

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This black coral is more than 4,200 years old. Named for the color of their skeletons, black corals come in many colors.
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How old is black coral?

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A submersible’s robotic arm collects gold coral in the Hawaiian Islands. Similar specimens have been dated at more than 2,700 years old.
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Collecting Gold Coral from the Deep Sea

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UV light illuminates growth rings in a cross-section of 44-year-old Primnoa resedaformis coral found about 400 m (1,312 ft) deep off Newfoundland.
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Coral Growth Rings

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Scientists recently discovered the Christmas tree coral (Antipathes dendrochristos) off the southern California coast.
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New Christmas Tree Coral

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The robotic arm of the Jason, a Remotely Operated Vehicle (ROV), collects several stalks of black coral from the seafloor.
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ROV Collects Black Corals

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Lights attached to this deep-sea camera system enable scientists to capture detailed images of deep-sea corals in otherwise dark water.
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Deep-Sea Camera

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The Autonomous Underwater Vehicle (AUV) SeaBed is about to be deployed.
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Autonomous Underwater Vehicle

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The Hawaii Undersea Research Laboratory’s Pisces V submersible is lowered for a dive to study deep-sea corals.
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Submersible Launch

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This computer screen image shows views of each sonar beam and the path being mapped by the ship.
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Multibeam Sonar Screen

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3-D map of Chapman’s Reef. Produced in 2005 with multibeam sonar from an autonomous underwater vehicle (AUV).
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Deep-Sea Coral Reef Map

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A robotic arm on the Johnson-Sea-Link submersible retrieves Galatheid crabs for research. In the background is a species of the deep-sea coral Lophelia.
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Collecting Deep-Sea Crabs

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