 It was one of several underwater-themed films released around 1989; similar films distributed during that time-frame included "The Abyss", "Leviathan", "DeepStar Six", "The Evil Below", and "The Rift".Set on board an undersea laboratory in a near future ocean where the Earth's ozone layer has been depleted and new means of habitation and survival are being explored, biologist Claire is working on an unknown specimen when she experiences psychic visions.Meanwhile, a routine crew replacement is inbound in a mini-submarine when an undersea quake occurs.