In "400 Days (2015)," a group of astronauts embarks on a simulated mission to a distant planet to test the psychological effects of deep space travel. As their time in isolation stretches to 400 days, tensions rise, and reality blurs with the simulation. Strange occurrences and unexplained phenomena challenge their sanity and grip on reality. The crew must navigate through their own fears and doubts as they grapple with the unknown forces at play. As the line between what's real and what's not starts to blur, they must unravel the mysteries surrounding their mission before it's too late. "400 Days" is a gripping sci-fi thriller that delves into the depths of the human psyche when faced with the unknown and the unexplained. Will the astronauts survive the psychological challenges of their mission, or will they succumb to the darkness lurking within the confines of their simulated world?