Look at this one. It's got sharks guarding treasure around a sunken Spanish Galleon. it's even got divers swimming around WITH SOUND and it's programable. And the graphics are off the hizzy.
Wow! Now this is Awesome! It is the best one of all. Hope you like it.
http://sharkvisions.atlantis3d-inc.qarchive.org/ and its free! You can upgrade if you wish.
I see something different every time. It's almost like watching a movie.
Goodyguy~
*I just downloaded the demo and its totally awesome.

Oh and I'm using vista 64 but it also works on older platforms as well.