The story goes that a ship of humans is designed and sent off into space as a last-ditch effort, heading towards a perfectly hospitable planet without any life on it, right before all life on Earth dies out. The ship spins to generate gravity, and inside the large cylindrical body there is a massive farm to sustain the people.
They all believe that they are meant to colonize the planet, but the ship was designed to crash, killing the people, but not explode as that would burn up the bacteria stored in the feces that the ship has stored for centuries. The whole plan was to inject bacteria into a neutral environment so that life could evolve again, as the designers deemed humans unworthy of continuing. There was also two kids that grabbed spacesuits and hid in the waste matter to survive the crash, and lived out their lives as guardians of the bacteria colonies.