A series of films centre around six friends reunite for a caving expedition. Their adventure soon goes horribly wrong when a collapse traps them deep underground and they find themselves pursued ...

Distraught, confused, and half-wild with fear, Sarah Carter emerges alone from the Appalachian cave system where she encountered unspeakable terrors. Unable to plausibly explain to the authorities ...

After their class reunion, Yukari, Kiriko, and Niko launch a website for punishing people who have done wrong, yet escape law enforcement. As their website goes viral, Kiriko and Niko's acts of ...

A woman goes on vacation with her friends after her husband and daughter encounter a tragic accident. One year later she goes hiking with her friends and they get trapped in the cave. With a lack ...

I mean underground, like mole people or the monsters from The Descent. Haven't thought about that horror movie in a while, huh? Don't worry Theorists, with today's episode I'm going to make sure ...