This really is a cool new underwater gadget: Subwing! A new watersport that gives you the sensation of underwater flight with virtually full freedom of movement. Glide through the water like a dolphin, do thrilling spins and turns, or just relax on the surface.
The SUBWING consists of two separate wings connected in a rotatable swivel. By grabbing the grip on each wing, it can easily be controlled in all directions.
More info on Subwing.com