Generate a question that has the following answer: Reactor for the following movie plot: In 2174, the human population has exceeded the carry capacity of Earth, leading humanity to build a huge interstellar ark named Elysium. Its mission is to send 60,000 people on a 123-year trip to establish a colony on an Earth-like planet named Tanis. The passengers and crew are placed in hypersleep, with a rotating crew who awake for shifts of two years each maintaining the ship throughout the journey. Eight years into the mission the ship receives a transmission from Earth in multiple languages: "You're all that's left of us. Good luck, God bless, and godspeed." Some unknown time later, two members of the flight crew, Corporal Bower and Lieutenant Payton, are awakened from hypersleep. Improper emergence from the hibernatory state leaves them both with partial amnesia. The ship is experiencing power surges caused by an unstable nuclear reactor, which leaves them unable to enter the bridge, although they have steady power in their quarters. Bower ventures into the seemingly abandoned ship using the ventilation system with the intention of stabilising the reactor in case it goes critical. After suffering panic attacks from his claustrophobia he begins to suffer symptoms of "Orbital Dysfunction Syndrome", nicknamed "Pandorum", a severe psychotic illness known to appear in deep-space travellers causing delusions, paranoia, hallucinations and violence. It is known to have been the cause of the disastrous "'Eden' mission," in which the captain of a large starship called the "Eden" became so afflicted with Pandorum that he became convinced that the flight was cursed and ejected his entire crew of 5,000 to their deaths. Bower encounters Nadia, a former geneticist and Manh, an agriculturist, and they are attacked by a group of cannibalistic pale-skinned humanoids with heightened senses of smell and strength and a seemingly tribal culture. Bower's group flees into a barricaded chamber and finds a cook named Leland, who has been awake for years, living off the water leaking into the ship, the algae it creates, and...
Answer:
What does Bower's group find?