En plongée was a 1926 French film directed by Jacques Robert. It was based on Fragments d'épaves, a novel by Bernard Frank. It was shot in Monaco, but set in Brittany. It is a spy film.
It was reviewed in Cinémagazine in 1928.
Cast
Lilian Constantini - La princesse Nouriskine
Daniel Mendaille - Maurice de Vergnes, un officier de marine
Pierre Alcover - Howell
Olga Noël - Anna Guérec de Vergnes, la femme de Maurice
Mathilde Alberti - Moussia Fedorovna, une espionne, l'ex fiancée de Maurice
Harry Arbell - Le Bozec
Claire Darcas - Madame Howell
Boris de Fast John
Henri Desmarets - Karl
Jean Napoléon Michel - Frantz
Pierre Séguier - Pierre