I would settle for the infamous French prison, Devil’s Island.
"The rule here is total silence. We make no pretence of rehabilitation here. We're not priests, we're processors. A meat packer processes live animals into edible meat. We process dangerous men into harmless ones. This we accomplish by breaking you. Breaking you physically, spiritually and here. Strange things happen to the head here. Put all hope out of your mind, and masturbate as little as possible. It drains the strength."
That would be ok too, just don't let them meet up with Papillon. We want them to stay there for the duration.