Shot documentary style, this is the unpleasant story of what happens when two scuba divers are left behind in the ocean by their tour boat. The first fifteen minutes, which tries to establish the relationship between the couple, does not work all that well. But from the point after which they are stranded the movie becomes increasingly harrowing, ultimately ending in a bad way (and exactly how you think it will end). The best things about OPEN WATER are the shark scenes and the fact that it tries to be DIFFERENT.