Just saw a vid on MSN this morning of an underwater scooter type of vehicle called the Bob. Battery powered, self contained with tank and helmet. Very intereseting idea, but as the passenger is surrounded and protected by the structure of the vehicle I can see how this could end up causing an awful lot of damage to a reef or any bottom structure. I was both impressed by the creation and scared when I envisioned the damages such a vehicle could cause if handled by amatures. It's anticipated price shown in the video seems like it will certainly be well within the range of a lot of hobyists and gadget freaks. Anyone familiar with this machine and it's intended market?