The film reunited a 1960's "mythical couple' Alain Delon and Romy Schneider. Schneider had dramatically broken-up with Delon couple years earlier and married German director and actor Harry Meyen in Berlin. She had a child. Delon insisted on her being cast, threatening to quite the film if she wasn't, despite producer Gérard Beytout's misgivings, as he was dubious about the actress from the Sissi (1955) trilogy in a bikini. Delon continuously pursued her, both before and after filming, with persistent attempts to reconcile. Despite Schneider's refusals, their shared history and emotional connection spilled onto the screen, infusing the film with raw authenticity. This genuine emotional backdrop, rooted in their real-life relationship, transcended the film's narrative, elevating it beyond its initial reception. While the original film may not have garnered universal acclaim, its enduring appeal lies in the palpable chemistry and complex emotions brought by Delon and Schneider.

A body of someone that has just drowned does not float on water. Only after the decaying process has started and gases build up in the body does the body float to the surface.

The opening credits shimmer, as though they were being projected onto the surface of the swimming pool.

English version. As all the cast, except Paul Crauchet, were fluent in English the scenes were shot both in French and in English. This version proves to be funny for the English-by-the-book used in the dialogue (obviously a line by line rendition of the original French script). The English version is also about ten minutes shorter with slightly different edit and has a few other differences (such as Romy Schneider wearing a bikini top in the English version in scenes where she is topless in the French version).

Featured in La vengeance du serpent à plumes (1984)