Situation Hopeless... But Not Serious

Situation Hopeless... But Not Serious is a 1965 comedy film starring Alec Guinness, Mike Connors and Robert Redford. It is based on the novel The Hiding Place by Robert Shaw.

In World War II, two American fliers, Captain Hank Wilson Robert Redford and Sergeant Lucky Finder Mike Connors, are forced to bail out over Germany. They encounter Wilhelm Frick Alec Guinness, who hides them from the authorities in his cellar. He enjoys their company so much that he does not inform them when the war ends. Instead, he maintains a masquerade to convince his guests that Germany is still fighting. Eventually, after seven years, the Americans escape into a peaceful West Germany and find out the truth.

Source: Wikipedia