Let’s face it, oxygen tanks can be cumbersome when scuba diving, but the ExoLung aims to change that. Simply put, this contraption converts the diver’s swimming motions into air movement. How does it work? It consists of a buoy that floats on the surface of the water that not only keeps you safe, but doubles as an air intake. You connect a hose to this buoy with the water bell worn on the front of the torso, while inside is a collapsible water bladder that is attached to leg straps that secure around the diver’s feet.