During World War II, a group of Navy men are sent to steal Enigma (the Nazis' top-secret decoding device). When their own ship is destroyed, they must secretly make their way through hostile waters in a severely damaged Nazi U-boat to safety with the device

Set during the Battle of the Atlantic during World War II, the film tells the story of the cat and mouse hunt between the USS Haynes, a destroyer escort, and a German U-Boat. Captain Murrell, a former Merchant Mariner, saw his wife killed when his freighter was torpedoed by the Germans. Von Stolberg, the veteran U-Boat commander, sees no honor in the German aims of the war. Both of these highly experienced men must now try to outthink and outmaneuver...

In the last days of WWII, Germany, desperate for any last grasp to defeat the Allied powers, looked to their last remaining weapons and soldiers. The German Navy and the last remaining U-Boats were formed together for one last mission, a mission to attack the United States mainland, Operation Seawolf. Captain Hans Kessler, a grizzled submarine commander from both World Wars, is called into service to make one mission successful and help turn the tide...