Beneath (2014) 🆕

As their grip on reality slips, the "monsters" they fear become indistinguishable from one another. Friendships dissolve into violence as the miners turn on each other, driven by a primal need for survival and the suffocating weight of the mountain above.

Tensions reach a breaking point as paranoia sets in. The miners begin to hear strange screams and scratching from beyond the chamber walls, leading them to believe other comrades might still be alive—or that something else is down there with them. They discover evidence of a similar disaster from 100 years prior where bodies were never recovered, fueling fears of a supernatural presence. Beneath (2014)

Contrast this film with the (which features a giant fish). Let me know how you'd like to expand this! Review: Beneath (2014) - Warped Perspective As their grip on reality slips, the "monsters"