two killers get trapped in tunnels

After a personal tragedy, Sarah joins her friends on a caving expedition in the Appalachian Mountains. But when a rockfall traps them deep underground, their adventure turns into a nightmare. As they search for a way out, the group discovers they are not alone—lurking in the darkness are savage, cave-dwelling creatures. With rising tension and dwindling trust, the women must fight to survive against both the predators and each other.

In a small tranquil community, a group of individuals must unravel the secrets behind a series of horrifying attacks by mysterious creatures that emerge from the depths of darkness.

A group of National Guard trainees on a routine mission find themselves up against cannibalistic mutants in the New Mexico desert.

A motocross team on their way to trial a new super-fuel head out across the desert lead by Rachel, who, unbeknownst to the rest of the group, is a survivor of the cannibal clan which menaced the Carter family several years before.

Film student Jay is currently planning his graduation film, which follows a simple premise: he films himself and his friends, who are hiding something from him, on a boat trip. He wants the truth to come out and the camera to capture it all. The trip leads the group into a tunnel shrouded in mystery, from which there is suddenly no escape and where things are clearly not right. And it soon becomes clear that anyone who speaks the untruth will feel the tunnel's fury.

The plot follows detectives Karl Roebuck and Elise Wasserman working together to find a serial killer who left the upper-half body of a French politician and the lower-half of a British prostitute in the Channel Tunnel, at the midpoint between France and the UK. They later learn that the killer—who comes to be nicknamed the "Truth Terrorist"—is on a moral crusade to highlight many social problems, terrorising both countries in the process

Eight strangers awaken with no memory, in a puzzling cube-shaped room where the laws of physics do not always apply.