Group of people living underground tunnels has monster in it

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 what happened - or why she's covered in her friends' blood - Sarah is forced back to the subterranean depths to help locate her five missing companions.

After a tragic accident, 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 by bloodthirsty creatures. As their friendships deteriorate, they find themselves in a desperate struggle to survive the creatures and each other.

After a catastrophic car crash, a young woman wakes up in a survivalist's underground bunker, where he claims to have saved her from an apocalyptic attack that has left the outside world uninhabitable.

It is 1879 in the Dakota Territories, a band of men who set out to find and recover a family of settlers that has mysteriously vanished from their home. Expecting the offenders to be a band of fierce natives, but they soon discover that the real enemy stalks them from below.

The Burrowers follows Chris Packham as he goes underground to take a look at the subterranean world of some of the country’s most iconic animals.

Near a remote town, the repeated dumping of toxic waste causes an underground cave dweller to mutate into a hideous monster. A construction team that is digging a tunnel accidentally disturb the creature's habitat causing it to attack.

Three young adults, obsessed with the horrors of the modern world, find themselves trapped in the depths of a sprawling underground subway, which gradually transforms into a massive, nightmarish organic entity, eager to assimilate them for good.

A group of friends fight for their lives against bloodthirsty creatures lurking in an underground military base.

After years of underground atomic testing, one of the animals living within the Wisawa caves (a system that stretches from Phantom Lake to the Deadlands) has undergone a radical and unimaginably horrible transformation! While exploring the caves, Dr. Vincent Edwards and colleague Rosemary Bennett stumble across evidence in the disappearance of local children. After reporting the find to the local sheriff, Dr. Edwards and Rosemary are tapped to lead a rescue attempt. Along with the sheriff and small-town farmer Stan Johnson (the children's father), the rescue party quickly comes to the realization that if the caves don't get them, whatever unseen terror lurking in the shadows just might!

After a wild bachelorette party, a group of young women find themselves trapped in an underground bunker complex. A disturbing finding turns their night into an absolute nightmare. Will they be able to escape from this vast concrete maze?