[cdavis]

Looking at the videos, it appears that virtually all of the propulsion results from bending the knee. Is that correct? If so, that is a pretty extreme concentration of effort on a few muscle groups, seems like you would get tired quickly. The lactic burn on a long dive should be prohibitive. If all you are using are knee muscles and the gadget is so efficient that you don't get tired, this would have to be the best way to depth ever.

Connor