The play is adapted from the best-selling science fiction series of the same name by Hugh Howey. The story takes place in a dystopian future where about 10,000 humans live in a 144-story silo-shaped bunker. They are told that the outside world is infected by poisonous gas.It became unfit for human habitation, and the remaining survivors took refuge in the bunker and formulated rules to maintain the operation of the new society in the bunker.