A British frogman undertakes a daring mission to sabotage the Italian fleet. His cunning plan involves hijacking an enemy midget submarine and loading it with explosives, before returning it to its original location. World War II adventure, starring Laurence Harvey, John Clements, Dawn Addams, Michael Craig and Sid James

A British frogman undertakes a daring mission to sabotage the Italian fleet. His cunning plan involves hijacking an enemy midget submarine and loading it with explosives, before returning it to its original location. World War II adventure, starring Laurence Harvey, John Clements, Dawn Addams, Michael Craig and Sid James