Released in 1995.
Plot line: You can almost hear the studio pitch meeting echoing throughout Crimson Tide like the sonar on the soundtrack: "It's The Cain Mutiny on a nuclear submarine!" When radio communications problems aboard the USS Alabama prevent the sub from receiving its orders clearly during a tense confrontation with Russian warships, Navy officer Denzel Washington faces a huge ethical dilemma: countermand the orders of legendary Captain Ramsey (Gene Hackman) to fire nuclear missiles, or follow his command and risk launching an unprovoked nuclear war. It's really an actors' picture, and the fun is in the fireworks between Washington and Hackman, each of whose characters articulates solid reasoning behind his decision. There are no easy villains, and there's no easy way to tell right from wrong - that's what makes the nuclear stakes so terrifying.
I've been watching submarine movies lately, and recently watched this one again. This is a really good movie. The acting is superb and the story telling - alas, they don't really tell stories this well any more.
You can see the movie trailer here. If you have yet to see it, this is a movie worth watching.