At the height of the Cold War the U.S.Navy nuclear submarine USS Wayne,commanded by Captain Phil Kettenring,is dispatched to a secret mission involving scientific tests.On board is Dr. Dykers who is supposed to conduct the secret scientific tests.Commander Kettenring doesn't know that secret Communist agents impersonating US Navy crew members are also on board.Their mission is to sabotage the American submarine and to steal the experimental anti-ballistic missile guidance system.The Communists have set a trap in mid ocean for the USS Wayne.As the problems start Captain Kettenring falls ill,Dr. Dykers becomes agitated and difficult and the crew begins to loose faith in their commanding officer.The mission is in danger unless Captain Kettenring can discover who the enemy agents on board are.