The Silent Enemy DVD (Region 1) Widescreen. Black & White. Laurence Harvey, Dawn Addams, Michael Craig.
On Dec 19, 1941, Italian frogmen, using underwater mines, destroyed two British warships at Alexandria, Egypt. When it was learned that they were operating along the Spanish coast across from the British base at Gibraltar - putting British and later American shipping at risk - naval explosive and bomb expert Lionel "Buster" Crabb is brought in to create a team of divers to strive against the might and power of Fascist Italy. Made a year after Crabb was murdered by the Communists, this is a remarkable and unique film about a fascinating and obscure battlefield of the War. Essential viewing.
(A footnote: James Bond author/creator Ian Fleming was almost certainly aware of either this film or, more likely the actual events, and used it as the inspiration for Thunderball. Certain plot points were obviously lifted and the final section of this film is almost a shot-for-shot preview of the final section of both the Bond novel and film.)