ExoLung is a simple, innovative underwater air supply enabling the freedom of a scuba-diving experience minus the complicated gear and certification requirement. Still in the protoype phase, ExoLung is a surface-supply system that utilizes a 16.4-foot hose to draw air from above while you dive but also integrates a technology that uses your body motion to keep the air flowing. Other surface-supply systems depend on compressors or batteries. With ExoLung, as long as your legs continue to move, air will flow.