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, ...

Scorkl is small, lightweight breathing-device you can pump up yourself, meaning it is a one-time-cost to be able to swim underwater for 10 minutes at a time, or hang a couple of Scorkls on your belt ...