Capricorn One (1977)

In "Capricorn One" (1977), a Mars mission orchestrated by the government is revealed to be a hoax. The astronauts involved are forced to participate in a charade to maintain the deception, but they soon realize the danger of their situation. As they try to expose the truth, they face a race against time and powerful forces trying to silence them. The movie delves into themes of government conspiracy, the ethics of deception, and the resilience of individuals against manipulative forces.