Les défonceuses (1980)

Alternate Titles
Agathe et Martha Pierre Unia Unia Films, soft, 85 mins.
Caraibi – Sapore di sesso Italy, hard version
Les Defoncées
Fesses à claques, petits culs à dépuceler 1986 hardcore re-release
Lady Chatterley II Dir. given as Lawrence Webber German and Italian releases of soft version
Miss Innocence USA

As usual with Pierre Unia, you get beautiful girls, beautiful locations, lots of lesbians and some undersea lovemaking. And also the itsiest-bitsiest-weeniest ghost of a story.