The Valiant (1962 film)

The Valiant is a 1962 BritishItalian international coproduction film directed by Roy Ward Baker, and starring John Mills, Ettore Manni, Roberto Risso, Robert Shaw, and Liam Redmond. It is based on the Italian manned torpedo attack which seriously damaged the two British battleships Valiant and Queen Elizabeth and the oil tank Sagona at the port of Alexandria in December 1941.

Alexandria December, 1941. Two Italian frogmen are captured under suspicion of placing a mine under the HMS Valiant. They are brought onto the ship for questioning.

Source: Wikipedia