A film with more than the usual spoiler issues. Talking about it in any detail feels akin to handing you a gift-wrapped present and saying, "I hope you like it -- It's a thriller about a diabolical secret experiment."

This is a must-see and one of the best documentaries - and films - of this year.

This movie feels like it was made purely to piss off people who want good shows

The film never slows down or bores, plunging from one harrowing sequence to the next.