U67 (1931)

Originally released as The Sea Ghost

Stars: Alan Hale Sr., Claud Allister, Clarence Wilson
Director: William Nigh

Years after losing sight of a German U-boat -- a mistake that led to a costly court-martial -- former U.S. Navy skipper (Hale) comes face to face with the elusive U-boat's captain on a mission to retrieve a sunken treasure!