Le Trou

Four cellmates who expect long prison sentences, or execution by guillotine, are determined to escape. Before they can start digging a tunnel, the prison staff puts a man arrested for attempted first-degree murder, Gaspard, into their cell. They have no choice but to fill him in. At first he is enthusiastic about taking part in the getaway, but as the tunnel nears completion the warden tells him that his alleged victim has withdrawn the charges and that he will be released soon. Returning to the cell, Gaspard has to dispel the suspicions of his cellmates that he turned them in. He does, and they continue with the escape as planned. However, in the last moments, before the five are just about to leave through their tunnel, they understand that they have been betrayed. The last scene is of the four cons being stripped to their underwear before going into solitary confinement, and of Gaspard, walking to his cell down the hall, clothed in his escapee street clothes, where he will await discharge.

La prison de la Santé, à Paris, en 1947. Un jeune bourgeois, Claude Gaspard, accusé d'avoir tenté de tuer sa femme, est enfermé dans la cellule numéro 6, où se trouvent déjà Jo, Roland, Manu et Vosselin, dit "Monseigneur". Ces quatre détenus préparent leur évasion depuis un bon moment et l'arrivée de Gaspard les contrarie plus qu'autre chose. Le nouveau venu raconte son histoire. Il finit par être adopté. Mis dans la confidence et convaincu que sa peine sera longue, il décide de prêter main-forte à ses compagnons. Roland perce un trou dans le sol pour atteindre les souterrains. De là, les cinq hommes creusent un tunnel pour rejoindre les égouts...