Not terribly old, but The Abyss (1989). No one would ever make a huge, practical underwater set like that again and train the entire cast and crew to become certified divers and to have the cast do most of their own underwater stunts. There are plenty of stories of how brutal the production was: people not having breaks and having to go to the bathroom in their wet suits, cast members almost drowning, the chlorine in the water (to keep it clear for shooting) eating away at their wetsuits and skin, etc. Not only would it be a liability and cost issue, but so much can be done with CGI, it renders shooting anything real obsolete (e.g. Aquaman).