| Action, Drama, War
During World War II, two Italian frogmen, who placed magnetic mines under a British warship, are captured and interrogated by British intelligence about their mission.
After the capitulation of Italy, de la Penne went to fight on the British side of the underwater war. When, in March 1945, he was being presented with the Italian equivalent of the VC for his role in the attack on the "Valiant", Captain (by then Admiral) Morgan was present at the ceremony, and he pinned the medal onto the man who had once been his enemy.
In the film, the Italians are seen to be given away by the bubbles rising from their breathing apparatus; during the war, the Italian frogmen used pure oxygen 'pendulum' breathing sets, in which exhaled gas is returned to the tank via a carbon dioxide filter, rather than the compressed-air apparatus used in peacetime - precisely in order to avoid the problem of a tell-tale string of bubbles.