La noche de 12 años

For start - better check the biography of the people represented in that movie, it'll give you a better overview over the events, as it's poorly presented in the production. But it's good. And by "hard" I mean what those people survived. It may seem as not that bad, yet of course being in terrible condition prisons, but that's what it is - nothing (!) happened to those people for twelve years aside from suppressing their existence even there. Almost no contact with others, not being let to go outside, not been given anything to spend their time and this really is a torture that can drive a person insane. Even the smallest everyday activity we don't care about (like going to the toiled) was a breath of air for them.