As a former submarine sailor I watch every submarine picture that is exhibited. None are exactly as it was or is. Most are a lot of fun to watch. This movie was very good as it entertained and kept you on the edge of your seat. This is a good escape from all the movies that are all explosions, blood and gore, fantasy, and vampire trash. This has a believable storyline even if the FX are a little unbelievable. You should watch this movie and enjoy it. Jude law is surprising in the role of the Capt. and is a great deal different than previous movie roles for him. The clash of personalities adds to the excitement through danger and mechanical malfunctions.