They get a group of people told they were going to be 'deported' and send them in. Then, it's like a video game with 100 levels, and you have a 60% survival rate. Probably about 40% of the rooms are deadly. If you live, they actually deport you (or maybe they have you work for them, I don't know). It's basically there way of getting rid of people who are against the government and making them too crazy (most people go crazy) to do anything to stop it.