French company Seabike has developed a swimming device that uses your own leg power to accelerate you through the water at superhuman speeds. This crank-driven pusher prop looks a bit like an ...

ExoLung uses a buoy that floats on top of the water as both a safety restraint and for taking in air. A 16-foot hose then connects the buoy to a collapsible water bladder attached to the diver’s feet, ...