This is a great movie for military enthusiasts and disaster buffs both. If you're looking for that, this is a classic.
Don't pay attention to reviews about military-based films by anyone who derides the movie as a "waterlogged Naval documentary," which contains two errors in one statement. First, there is no need to capitalize "naval," and second, what kind of snobby theater twit attacks a movie for being too "Naval" when the subject is about...a U.S. NAVY SUBMARINE? Next he'll attack Ghostbusters for being a shill for paranormal investigators.
Stupid reviewers aside, this is a good movie.