I'd almost give this an 8, but it was a bit slow in places and leaned more toward drama than action. That said, it still had enough thrills and suspense to surprise me, and was ultimately more enjoyable than I initially expected. All of the actors, both German and American, were great, except for maybe Scott Caan, who I nonetheless really like and perhaps his novice performance was befitting of his novice role. As much as I love William H Macy, I felt that the stars of this movie were easily Til Schweiger and especially Thomas Kretschmann, a personal favorite (who was also in my favorite submarine movie, U-571). "The wife scenes" with Macy plagued the pacing for me, but when it came to sincere moments between him and Schweiger, I was enrapt. Cheesy as some of it may be, the more realistic ending surprised me, and must be appreciated too. Ultimately the movie's strongest point is the variety of situations not seen in other sub movies, such as the inclusion of a contagious sickness affecting both crews, some cooperation among them as opposed to just one or two, and the engagement of three or more ships/subs at once. Although not as big budget as U-571 (2000) or Crimson Tide (1995), it still satisfied and any sub-movie fan ought to enjoy it.