The crew of the American destroyer escort, the USS Haynes, detects a German U-Boat—resulting in a prolonged, deadly battle of wits.

Robert Mitchumas Capt. Murrell
Curd Jürgensas Kapitän von Stolberg
David Hedisonas Lt. Ware
Theodore Bikelas Heinie Schwaffer
Russell Collinsas Doctor
Kurt Kreugeras Von Holem (uncredited)
Frank Albertsonas Lt. J.G. Crain
Biff Elliotas Quartermaster
Michael McHaleas German Soldier
Alan Dexteras Lt. Mackeson (uncredited)
Harold Rosson