This would have been a wonderful B monster movie. It has the cool monsters, the camera moving through kelp, the silly teenagers, and the 'concerned townspeople.' It even has the subplot of the typical oppressed individual wanting to protect his land/house/insert item here. However, a problem would be that at least half way through the flick, we still don't know where they've come from. Not that I care too much, but when it's in the tagline that they are failed experiments, wouldn't you expect to see more of that? Just pointing it out. And, the most grievous problem is that as noted in the 'trivia' section, the producer added more sex scenes because he wanted to make it 'more sexy'. And while, yes, gratuitous nudity is common in these sorts of flicks, the kind they added here is just offensive. The first real sex scene is of one of the monsters raping the woman. I can ignore a lot of things, but this isn't one of them.
Review of Humanoids from the Deep
