this movie set out to do something very particular and it also set out not to do certain thing . in short it have a definite premeditate trajectory to deal with the idea of face death ( with very few choice and all of them bad ) a grave and real rather than something casual or amuse . in search of that realism it have eschew certain convention such a obvious character arc and hook . it not about the character so much a about the human condition . never mind what the actor would do . what would you do in their situation . open water may have be a starting notion for this movie but it go a lot far . unlike that film it doesn not cheat the audience in the end when you find out there aren not really any shark to speak of at all . this have a real monster and not just the idea of a monster and not just an animated stand in . it also have fine production value give what these very resourceful filmmaker have to work with . and again in contrast to that other film it have some exhilarating and brilliantly render action at it climax . and let not forget the and shall we say wouldazzling and screen presence of it young star . she may prove to be quite a discovery .