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Geologist Dan Fornari and volcanologist Adam Soule prepare the towed camera system for nighttime operations. The camera is towed 100 to 300 meters (328 to 984 feet) behind the ship at 1/4 to 1/2 knot, the equivalent of walking at a leisurely pace. A regular camera would not work in such an extreme environment, where it must take pictures despite total blackness, crushing pressure, and freezing temperatures. (Photo by Amy Nevala)

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