James Cameron’s The Abyss remains one of the most unique sci-fi thrillers of the late 20th century. While often overshadowed by Cameron’s later blockbusters like Terminator 2 or Avatar, it is a masterclass in tension, practical effects, and underwater cinematography.
Searching for "The Abyss 1989" archive.org returns a chaotic but beautiful library: the abyss 1989 archive.org
If you want to explore responsibly, here is a guide: Diving Deep: A Viewer’s Guide to The Abyss
If archive.org doesn’t have what you need: it is a masterclass in tension