In post-Soviet Russia, civil war erupts as a result of the ongoing conflict in Chechnya. Military units loyal to Vladimir Radchenko, a Russian ultra-nationalist, take control of a nuclear missile installation and are threatening nuclear war if either the American or Russian governments attempt to confront him.
The USS Alabama, a U.S. Navy ballistic missile submarine, is assigned to a patrol mission to be available to launch its missiles in a pre-emptive strike if Radchenko attempts to fuel his missiles. Captain Frank Ramsey (Gene Hackman) is the commanding officer, one of few submarine commanders left in the Navy with combat experience. He chooses Lieutenant Commander Ron Hunter (Denzel Washington) as his new XO, who has an extensive education in military history and tactics, but no combat experience.