OTF
Coney Island Whitefish Biologist
@TCDiver1 earlier in the thread recommended Sea Hunt. Seconding that. It's free on youtube. It's old like some of the other stuff in this thread, and a tv show not movie, but it's definitely all about scuba diving and was hugely influential. Fun show. Mostly holds up, not unlike older james bond movies. Been meaning to sit down and watch all of it: https://www.youtube.com/playlist?list=PLPd5byT7sJ9K8pP51dFSiTc5on3bAWrP5