The best thing about this movie...
Is the very scene, the underwater scuba sex scene. After that, it goes downhill fast. I like movies with good scuba scenes, but this one is kinda blaah. OTher than that first bit, the second scuba scene, where Tricia O'Neil's character finds the body of the diver (and lets out that great scream through her regulator) is the best bit.
I wish they had let her wear that wetsuit she has on during the final scene in her other two scuba scenes, or at least let us see her topside in it. From I can see, she looked pretty good in it.