1941, France and the Allies are on the verge of losing the war. The Germans have just developed a new submarine. Undetectable and elusive, it destroys everything in its path.
With his back to the wall, General de Gaulle decides to send a suicide mission from London to try and steal this war machine from the Germans. He calls in Lieutenant-Colonel Gaston Loboutin, a dedicated officer who doesn’t ask too many questions.
The General imposes his team on him: Félix and Jules, supposedly ex-servicemen in the navy. Rico, a scheming former sergeant. Hunted by SS chief Frantz, known as «The Butcher», this fine team will somehow manage to reach Saint-Nazaire, where the Submarine is moored. A big surprise awaits them. The reason the Submarine is so special is that it’s actually a time machine created by a mad scientist named Greta. Will Gaston, Félix, Jules and Rico manage to foil Frantz’s traps, at the risk of becoming trapped in an infernal time loop?