The Depths
Les abysses (original)
Starring Francine Bergé, Colette Bergé, Pascale de Boysson, Colette Régis, Paul Bonifas, Jean-Louis Le Goff, Lise Daubigny, Robert Benoît, Marcel Roche
It's a drama movie, and has a rating of 6.3 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Switzerland.