The Lawnmower Man and one of the Poutine Bros from Supertroopers get trapped in a mine.
This movie is made competently, but that's about it. You have a pretty good setup that gets you interested in the characters and an interesting setting shot well that really makes you feel claustrophobic early. Then the space opens up and plotting loses focus as nothing much happens for about 70 minutes. The last 10 minutes brings back some of that much needed claustrophobia.
But there's never any real explanation or motivation so it all feels in service of nothing. They were missing a couple of critical things that would really make this a horror flick, as it is it feels like a mediocre thriller with some horror elements shoehorned in.