Hauntingly scary and gives the kids a good reason to be scared to go into the water! he he he... But it can probebly use a few more swiveling propellers! Which I wonder, what do they call propelers that go on submarines?
They're still propellers, although there are also like pump-jet propulsors for smaller subs. I imagine those things on the knees are mobility thrusters of some sort but who said we had to be too conventional with this kind of stuff? =_-;
Yeah I know what you mean, that sort of stuff takes lots research and too much is a waste of time unless you really plan to do some thing else with it. But if its ment to be vaguely realistic then its gotta look as convinceing as possible to were even an educated person can say that a Sci-Fi machine looks like it could realy work.