Four astronauts, led by the determined Commander Theo (portrayed by Brandon Routh), embark on a groundbreaking simulation to test the psychological limits of long-duration space travel. Locked inside a sealed, underground bunker for 400 days, the crew, including the skeptical engineer Cole (Dane Cook) and the pragmatic physician Emily (Caity Lotz), must maintain their sanity and cohesion under extreme isolation. As the days stretch on, mundane routines give way to creeping paranoia and unsettling phenomena, blurring the line between reality and the simulation's intended design. Directed by Matt Osterman, this tense sci-fi thriller explores the fragility of the human mind when cut off from the world. When a catastrophic event severs their communication with mission control, the crew faces a chilling choice: trust that their ordeal is part of the experiment or confront the terrifying possibility that they have been abandoned forever. With a claustrophobic atmosphere and mounting dread, "400 Days" keeps viewers on edge as the astronauts grapple with their own sanity and the dark unknown lurking just beyond their steel walls.