Ok, well, for the sake of people that may not have watched it yet, BEWARE POSSIBLE MINOR SPOILERS BELOW!!
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Shooting it in a documentary style where they're recounting what happened to them suggests to me that whatever is happening, in the end they all make it out alive. So really no matter what goes on, it looks like theyre never in any real danger. That's why im hoping a twist will turn things upside down.