• Mind-controlled sharks, anyone?
• It features an attractive female character who scuba-dives while wearing a Technisub wet-suit jacket.
• Some male characters also do some scuba diving.
• The movie is in the public domain.
• Another flick that concerns the Bermuda Triangle (though neither John Huston nor Miguel Angel Fuentes appears in this particular film).

https://retrofilmvault.com/listings/bermuda-cave-of-the-sharks-1975/
http://mondoexploito.com/?p=8211
https://youtu.be/iwLvR_f1MO8
https://www.imdb.com/title/tt0077225/?ref_=ttco_co_tt