A civilian diving team is enlisted to search for a lost nuclear submarine and face danger while encountering an alien aquatic species.Formerly married petroleum engineers who still have some issues to work out. They are drafted to assist a gung-ho Navy SEAL with a top-secret recovery operation: a nuclear sub has been ambushed and sunk, under mysterious circumstances, in some of the deepest waters on Earth.An American nuclear submarine encounters an alien species, which coincidentally causes massive electrical and hydraulic malfunctions, causing the sub to crash into an underwater cliff and sin ... More from IMDb