They'll keep you isolated, separated, and do everything in their power to get you to turn on each other. They'll start by getting you to write a paragraph or a page where there is one small thing that is a lie or that you don't believe mixed in with the rest. Your job will be to copy it down in your own handwriting. Non-compliance means beatings or starvation. Over time, what you have to write in your own handwriting becomes more and more pseudo-real and egregious, and the threats and punishments for non-compliance become more and more horrible.

At a Soviet camp, there was a priest who was hung on a cross outside all day. Twice a day, the cross was lowered to the ground, and all the inmates at the camp had to come out and defecate or urinate on the priest, or face severe torture themselves. The cross would then be raised again, and the guards would mock the figure on the cross. "Your Christ smells like shit now!" etc.

There is no limit to the horrible things that can happen when reason is allowed to be unfettered from reality and from ethics and values. When reality is considered subjective, EVERYTHING is on the table. Unimaginable, horrible, unspeakable things.