Incarceron

"Incarceron" refers to a sentient prison that seemingly randomly punishes or ignores the hundreds of thousands of inmates contained in its vast walls. Nobody escapes (though many have tried to make their way Outside), and life is constant war -- nasty, brutish, and short. Both the prison and its inmates fight over scrap bits of technology to make their lives easier (or in the case of the prison, to make new prisoners out of the dead).