Not SOV obscurities or regional gems, but horror where a good portion of the film is set under the ground - disused subways, bunkers, caves, sewer systems, mine shafts, tunnels - the deeper and darker the better! Gimme your suggestions!

Not SOV obscurities or regional gems, but horror where a good portion of the film is set under the ground - disused subways, bunkers, caves, sewer systems, mine shafts, tunnels - the deeper and darker the better! Gimme your suggestions!