Man is only truly alive when he confronts death

In the Orinoco river, Venezuela, a German submarine destroys a U.K. merchant ship killing its entire crew except for private Murphy. The lone survivor swears revenge against the Germans. He intends to blow the sub to kingdom come and its Nazis within! However the war, WWII, is almost over, so the retaliation must be executed before the peace is declared. Murphy's War is a 1971 movie, by Peter Yates, starring Peter O'Toole, Siân Phillips, Philippe Noiret and Horst Janson.