1989 American science fiction film starring Ed Harris, Mary Elizabeth Mastrantonio, Michael Biehn.

A civilian oil rig crew is recruited to conduct a search and rescue effort when a nuclear submarine mysteriously sinks. One diver soon finds himself on a spectacular odyssey 25,000 feet below the ocean's surface where he confronts a mysterious force that has the power to change the world or destroy it.

Read more: https://en.wikipedia.org/wiki/The_Abyss