Fantastic movie. I saw it two days ago, so Iv'e had some time for my opinion to properly marinate, and my excitement has not gone away. 'Underwater' is fantastically tense, and quick to the point. There was never a boring moment for me. When its not a harrowing escape, its a well constructed and tense quiet moment. Really, the best way to describe the movie is tense. It lets up just enough for you to have a break and then drags you back in again. The acting is well done too.