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Sea Nettle, Arctic Ocean

A leader and technical expert in deep-ocean photography, National Geographic photographer Emory Kristof pioneered the use of robot cameras and remotely operated vehicles, including the preliminary design for Argo, the submersible that found the Titanic. Kristof is known for bringing the technique and technology of shallow-water photography to the deep, introducing the world to such specimens as this ten-foot-long (three-meter-long) sea nettle found by a remotely operated vehicle in the Canada Basin, Arctic Ocean.

Photograph by Emory Kristof