A stranger named Constant disrupts the life of Flora, who is seemingly happy with her husband Lucien. But she suddenly experiences a passionate love, taking refuge with Constant in a cave they call “home under the sea.”
| Actor | Role |
|---|---|
 Viviane RomanceFlore | Flore |
 Clément DuhourConstant Mercier | Constant Mercier |
 Guy DecombleLucien | Lucien |
 Roland ArmontelMr. Dial | Mr. Dial |
 Jean BrochardQuoniam | Quoniam |
 René GéninCaptain | Captain |
 Anouk AiméeAnouk | Anouk |
 Robert DalbanCafe owner | Cafe owner |
 Dora DollProstitute | Prostitute |
 Guy FavièresTrade unionist | Trade unionist |
 Gabrielle FontanGossip at the washhouse | Gossip at the washhouse |
 Zélie YzelleThe mother | The mother |
 Paul FaivreMaresquier | Maresquier |
 Marcel DelaîtreKappel | Kappel |
 Santa RelliMadame Dial | Madame Dial |
 André CarnègeBoss of the bistro | Boss of the bistro |
| AAlbert GladoKid | Kid |
| JJean CarryNot listed | Not listed |
 Léon BaryBoss (uncredited) | Boss (uncredited) |
| JJean-Jacques Bourgeois(uncredited) | (uncredited) |
 Yves BrainvilleMiner (uncredited) | Miner (uncredited) |
 Pierre ColletMiner (uncredited) | Miner (uncredited) |
 René LacourtMiner (uncredited) | Miner (uncredited) |
 Geneviève MorelHousewife (uncredited) | Housewife (uncredited) |
| MMax Mégy(uncredited) | (uncredited) |