Two astronauts awaken in a hyper-sleep chamber aboard a seemingly abandoned spacecraft. It's pitch black, they are disoriented, and the only sound is a low rumble and creak from the belly of the spacecraft. They can't remember anything - who are they, what is their mission The only way out of the chamber is a dark and narrow airshaft. Corporal Bower (Ben Foster), the younger of the two, crawls inside, while the other, Lt. Payton (Dennis Quaid), stays behind for guidance on a radio transmitter. As Bower ventures deeper and deeper into the ship, he begins to uncover a terrifying reality. Slowly the spacecraft's shocking and deadly secrets come unraveled, and the astronauts realize that the survival of mankind hinges on their actions.