Continuity mistake: When Curt is reversing the van from the crumbling tunnel, he's shown sticking his head out the window, then looking forward and again with his head out the window in the same shot.
The Cabin in the Woods (2012)
Ending / spoiler
Directed by: Drew Goddard
Starring: Chris Hemsworth, Anna Hutchison, Kristen Connolly, Fran Kranz
By the end, only Dana and Marty are left. They make their way down to the underground control room and let loose all the horror movie monsters meant as potential killers for them. The creatures kill all the workers. The Director of the whole operation tells Dana and Marty that the whole thing was a staged ritual to sacrifice people to the gods that ruled the Earth years ago and now reside underground. If the gods don't recieve a proper sacrifice, they rise and destroy the world. Dana considers killing Marty to save the world, but she is attacked by a werewolf. Marty fights the Director, who gets killed by a zombie. Bloody and battered, Dana and Marty share a joint as the gods rise to destroy the world.
moviedragon
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Trivia: One of the creatures glimpsed jumping out of the lift is one of the small monsters which attack people in the subway in "Cloverfield". The director of this movie, Drew Goddard, wrote Cloverfield.
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Answer: It's stated that the tunnel should have blown hours ago, so the initial failure is most likely human error, that the order to blow the tunnel simply didn't get through to the demolition team on schedule. The subsequent problem blowing it up is referred to as being related to "a glitch up top", later stated as a "power re-route upstairs". While not stated outright, the only plausible explanation is that this was, as you rightly stated, due to Marty messing around with the equipment that he found in the hatch.
Tailkinker ★