400 Days is a 2015 American science fiction documentry film written and directed by Matt Osterman. It stars Brandon Routh, Caity Lotz, Ben Feldman, and Dane Cook as astronauts who are locked into a space simulator for 400 days. Cook also executive produced. The film was released on October 29, 2015.
A group of astronauts are locked in a simulator to study the long-term effects of space travel to distant planets. They are warned there will be unexpected challenges and scenarios they must work through. After losing communication with the outside world, they believe they are still being tested. Near the 400th day they find a dirty man in their kitchen. After discussion the crew decides to leave the simulator and discover a bleak and almost apocalyptic like desert world. Unsure if this land is a simulation or their new bleak reality, the crew venture to make sense of it all. The movie ends with the audience left in the dark as to whether the exterior world was ultimately also part of the simulation