The Abyss, starring Ed
Harris as Bud Brigman, was released in 1989. In
this movie, after a military sub is lost at sea, a small
group of oil platform workers, paired up with some
marines and a scientist, are asked to investigate.
While they are snooping around, they encounter an
alien-water-changer-thingy that just so happened to have
attacked the original sub. Things start getting
edgy because the Marines haven't been telling the entire
story to the rest of the crew.