Neat small submersible... built as a prototype craft with a maximum of 30' depth, this is an interesting boat. Make sure and check the pictures and videos.

Marion Hyper-Submersible Powerboat Design is proud to introduce the Hyper-Sub^TM Submersible Powerboat, a revolutionary new vessel with a design flexible enough to open the seas to industry, individuals, and the military in ways never before thought possible. The Hyper-Sub is the first small craft built with the horsepower, sea-keeping, and range to allow operation on the high seas, which also functions as a self-charging, autonomous, one-atmosphere submarine. The patented design, which was 31 years in the making, will forever alter the mini-sub industry.