|Harrison Ford||Captain Alexi Vostrikov|
|Liam Neeson||Captain Mikhail Polenin|
|Peter Sarsgaard||Reactor Officer Vadim Radtchenko|
|Joss Ackland||Marshal Zelentsov|
|John Shrapnel||Admiral Bratyeev|
|Donald Sumpter||Dr. Savran|
|Christian Camargo||Pavel Loktev|
Follows Captain Alexi Vostrikov who, at the height of the Cold War, is ordered to take over command of the nuclear missile submarine K-19, pride of the Soviet Navy. His assignment: Prepare the K-19 for sea and take her out on patrol -- no matter what the cost. But problems with the K:19 arise that may lead to a core meltdown and explosion that will certainly kill all aboard, and possibly trigger a nuclear war. Vostrikov must choose between his orders and the lives of his men.