THE ENEMY BELOW - 1957 American Color war film starring Robert Mitchum

The American Buckley-class destroyer escort USS Haynes detects and attacks a German U-boat (Unterseeboot) that is on its way to rendezvous with a German merchant raider in the South Atlantic Ocean. Lieutenant Commander Murrell, a former officer in the Merchant Marine and now an active-duty officer in the Naval Reserve, has recently taken command of the Haynes, though he is still recovering from injuries incurred in the sinking of his previous ship. Before the U-boat is first spotted, one sailor questions the new captain’s fitness and ability. As the battle begins, though, Murrell proves himself a match for wily U-boat Kapitän zur See von Stolberg, a man who is not enamored with the Nazi regime, in a prolonged and deadly battle of wits that tests both men and their crews. Each man grows to respect his opponent. Murrell skillfully stalks the U-boat and subjects von Stolberg and his crew to hourly depth-charge attacks. In the end, von Stolberg takes advantage of Murrell’s predictable pattern