A crisis in the Dunglo 17 coal mine draws an unsuspecting squad of Illinois State Patrol and their guides into the dark expanse of tunnels below the ground. As they descend, trying to make sense of what has happened, the situation, like their environment, grows darker and darker. Is it the "deep crazies" driving people mad or is there something more sinister lurking in the depths? More importantly, will anyone make it back out to tell the tale?