This movie is a great fun action film that did get me to feel for the characters only because I had taken a CPR class a long time ago and knew you have up to five minutes to resuscitate a drowning victim before brain damage or brain death sets in. That wasn't explained in the film. Otherwise, the action was fast paced, well shot, and the situations well explained. I am sure the science in this film is all correct. But however it it had an overall paint by the numbers feel to it where you never have a doubt they were going to make it out alive. It did manage to avoid the movie clichés like if their are two loving comical brothers in the film, one is going to die, or the black guy dies. It manages to miss several clichés but hits so many others.