A movie to see if you are not in the mood for some heavy thinking. There is plenty of action, the usual amount of dead people, and some pretty decent special effects. The movie is your standard terrorist movie, although it has the twist that these terrorists are working from inside a nuclear submarine. Since large parts of the plot are not too believable, the viewer should watch this in a relaxed state, just to enjoy some adrenaline, and not pay attention to the odd things that sometimes happen (like the guy can swim faster than the sub or a laptop computer that melts like it was made of foam). All in all, enjoyable if you are bored.