@Gonzo17
If you watch the beginning of

Starchaser: The Legend of Orin

People are in underground mines and they are told that if you go up you are digging closer to Hell & they do not know about the world above them

Tim Ozman has suggested something similar to that they might tell people that they are going to go to sleep for a long time then wake up underground in the planet Mars but they will really end up underground in earth doing mining work with no monetary pay & just get food & shelter