Mystery Submarine is a 1963 British war film directed by C. M. Pennington-Richards and starring Edward Judd, James Robertson Justice and Laurence Payne.

[1][2] The screenplay was by Hugh Woodhouse and Bertram Ostrer based on the play of the same name by Jon Manchip White.

U-153 is damaged during air attack in the Atlantic, and its crew abandon ship to escape chlorine gas now leaking from its battery cells.

Due to the intelligence windfall that this represents, the submarine is taken by a British prize crew to be examined and inspected (in much the same manner that befell the real German U-boat later renamed HMS Graph)[citation needed].

Their rescuers are astonished to learn that not only are the men they recover from the sea all British, but by attacking they have just sunk one of ‘His Majesty’s submarines…’ The Monthly Film Bulletin wrote: "The film is more or less competent of its extremely hackneyed kind, tolerably acted by Edward Judd and Joachim Fuchsberger.