Good movie, had a semi-twist, when i mean semi... i mean you had a hunch all the way till the end that makes you wanna see more.
more gore lulz.
anyway, kool thing to see a gory horror movie with mining tunnels this way, pretty clever, besides the hills have eyes.
i give this movie a 8.4
3d glasses helped alot, kool parts when they would point their guns, or throw shit, felt real.