The Rank Collection: The Silver Fleet

In this war drama set during WW II, an engineer in a Dutch shipyard assists the Nazis with the construction of two new kinds of submarines and finds himself a social pariah. Even his wife turns against her apparently traitorous husband. During the maiden voyage of one of the subs, the engineer talks high-ranking Nazis into joining him aboard their vessel. The Germans are unaware that the engineer has loaded the hapless vessel with dynamite. As that ship explodes, a group of commandos capture the other sub and smuggle it to England.