ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Diver propulsion vehicle (DPV). This torpedo- shaped device allows a diver or swimmer to explore a far greater area than would be possible if unaided. It can travel at up to 15 kilometres per hour, and allows its user to travel against currents that would halt an unaided swimmer. Photographed in the Maldives.
Model release not available. Property release not required.