When a group of cross-country skiers find themselves trapped by a freak snowstorm on a desolate mountain, they seek refuge in an old mining cabin. But what starts as a harrowing blizzard soon descends into a nightmare. Within the cabin's confines, they discover a hidden trapdoor leading to a sinister network of tunnels. Their desperate exploration takes them through hazardous passageways, revealing the secrets of the mountain's past. As they...