ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Diver propulsion vehicle (DPV). Scuba diver using a DPV to explore an underwater cave. This torpedo- shaped device allows divers or swimmers to travel far greater distances than would be possible if they were unaided. It can travel at up to 15 kilometres per hour. Photographed in the Maldives, Indian Ocean.
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