The engineer MacAllan designs a tunnel, which will join America and Europe together on the seabed. A group of American billionaires are financing the gigantic project, but the construction of the tunnel is proving to be as tedious as it is dangerous. MacAllan's worst enemy is the speculator Woolf, who had embezzled the money for the construction and who is attempting to cover up his crime by carrying out acts of sabotage. Also filmed in 1933 in a French-language version, LE TUNNEL, and remade in 1935 in England as TRANSATLATIC TUNNEL.

In 1942, a young paratrooper in the RAF returns to Czechoslovakia to encourage his fellow countrymen to sabotage the German war effort.

Five defense workers on their way to the munitions factory tell their stories: a refugee from the French Resistance, a frustrated race car driver, a prison warden, a former Miss America, and an intellectual who dropped out of society and saw the country as a bum.

French soldiers surrender to lying Nazis and are herded into a barbaric prison of war camp. From there they plan an uprising.

In occupied Berlin, an army captain is torn between an ex-Nazi café singer and the US congresswoman investigating her.

Austrian actor Franz Huber, known for his impressions, is captured by the Gestapo and forced into plastic surgery to become Hitler's body double. Their plan is to poison Hitler and use Huber to take control of the Reich. Meanwhile, Huber's wife Anna sees her life coming undone as her husband has disappeared and her two sons are indoctrinated into the Hitler Youth.

In Casablanca, Morocco in December 1941, a cynical American expatriate meets a former lover, with unforeseen complications.

The daughter of a musical mentor adores a promising composer, who is quite fond of the adolescent. When her father dies, an uncle arrives with his own grown daughter, who begins a romance with the composer which culminates in marriage but creates an emotional rivalry that affects the three.

Merle Oberon plays a Norwegian resistance figure in a small town, married to a Nazi commandant. When his superiors begin to suspect her, the Allies land an assassin to kill him -- an assassin who happens to be her former lover.

Bohemia in the 19th century, stage-coach driver Hans loves the mayor's daughter Marie, but she is promised Wenzel, the son of another wealthy farmer. Marie refuses to marry Wenzel because of Hans, but the marriage arranger tries to "buy" Marie from Hans. But when Wenzel tells Hans that he doesn't want to marry Marie either because he loves circus director Brummel's daughter, Hans decides to accept the offer of money for not interfering in the relations of Hans and Marie. But when Marie hears about this, she doesn't want to see Hans again.