Subwing

Water skiing just took a dive; not a wipeout, a dive. The Subwing ($TBA) is an underwater skiing device that turns you into a human submarine. Grab hold of the carbon wings and do flips, turns, and spins underwater as a boat pulls you and the Subwing along. No more nasty crashes with the latest in sports innovation. It’s putting the you into U-boat. [source]