A group of former military elites set out to explore an uncharted abyss, not knowing their worst nightmare is waiting for them deep beneath the ground.

A couple of youngish adventurers go into the wilderness of British Columbia in search of a lost colleague. Their plane crashes and they find themselves at the mercy of a crazed old Scottish miner, who has lived in isolation for many decades searching the mountain caves for a chamber of long lost gold. He is prepared to do anything - including murder - to keep his gold for himself.

A party of tourists -- including a state senator, a park ranger who was her one-time lover, a cantankerous professor, and an escaped convict -- are trapped deep inside the caverns of an unnamed national park, rescued briefly, and then caught in a second cave-in.

Ralph Burton is a miner who is trapped for several days as a result of a cave-in. When he finally manages to dig himself out, he realizes that all of mankind seems to have been destroyed in a nuclear holocaust. He travels to New York City only to find it deserted. Making a life for himself there, he is flabbergasted to eventually find Sarah Crandall, who also managed to survive. Together, they form a close friendship until the arrival of Benson Thacker who has managed to pilot his small boat into the city's harbor. At this point, tensions rise between the three, particularly between Thacker, who is white, and Burton, who is black.

Based on the true story of coal miners who became trapped underground in a cave-in on Christmas Eve, 1951.

A series of strange accidents plaguing a city located near the mine. Two people were pulled through the funnel, which formed after the collapse of tunnels under the lake. Geologist Nina Thiemann discovers that the mine tunnels are insecure and unstable. A woman with an expert in the field of explosions and a father, a former miner, descend into the ground, hoping that they will prevent catastrophe