I’ve been trying to find out who they were, when they went missing, etc and all I found was this:
“Bergman and the rest of the team also found old scientific equipment as well as GoPro with retrievable footage.”
https://www.techtimes.com/articles/240914/20190405/bodies-of-missing-divers-found-at-the-bottom-of-belize-great-blue-hole.htm
Odd, those don't use film.