The story is rather formula: take a bunch of different people and lock them up somewhere, put them in some sort of danger and see what happens (for instance: Night of the living dead, Das Boot, Pitch Black). Nothing new here. But the story unfolds rather nicely, with a neat twist towards the end. The acting is quite good and the atmosphere is tense, dense and thrilling. Major dissapointment are the special f/x, which look like the remains from a 50's cheap sci-fil flick. They add a touch of uncredibility to the all thing. Another letdown is the obligatory happy ending, which seems very out of place here. All in all this is a pretty good movie, which could (and should) have been much better - technically speaking.