Space pilot John on the way to get supplies to save his ailing daughter suffers engine problems and is forced to stop at what at first appears to be much needed aid in repairing his ship; however upon arrival John finds the place abandoned. John is now trapped on this space station running out of air but soon realizes that air is the least of his problems.
An underwater mining craft settles on the seabed to drill for oil. Despite no visual signs of life, the radar detects something in the vicinity. Tensions arise with the crew as they decide on a course of action, whether to abandon or continue the mission. The unknown outside, brings terror inside.