In spite of a great premise, capable cast, realistic sets, and passable special effects, this movie never really worked. The script is the main culprit, which forces a bunch of intelligent scientists to act like dumb teenagers at summer camp. The result is nothing more than a slasher movie with sharks instead of serial killers. There are also an improbable piling of coincidences that become increasingly illogical. It actually reminded me of "Leviathan," another underwater horror film which had a similar combination of assets and problems. The resulting film will be passable for horror and science fiction fans, but do nothing for anyone else.