A young woman who is a Speleologist teams up to explore an extremely deep cavern with a Geophysicist who believes that the earth is hollow and the Underworld is accessible through caves. Once sealed by Aboriginals, the pair soon regrets reopening the cave.

When a boy is lost in the darkness of a mine, a man resolves to confront his own worst nightmares.

A stint locked in the basement saves a young boy from unexpected danger. Living in his aunt's basement, a young boy imagines monsters coming to attack--until something much deadlier happens.

Two designers visit a historic English hotel with an attached maze, looking to propose a redesign of the property. As the maze entices them in mysterious manners, they come to uncover the dark history that continues to live on within its hedges.

British schoolteacher Paul once lived a quite life alongside his girlfriend, Anya. After the bomb, he's become the leader of a terrified group of survivors with only one place left to flee from the radiation - an abandoned system of mines.

When a thirteen-year-old boy sheds his goody two shoes reputation for a day and skips school to explore Manchester with his friend, he doesn't expect to find himself in an underground cave system full of monsters, fighting to survive.

Three friends in a magical world descend a staircase into the abyss at the edge of the world and encounter forces they can't control.

A man and his friends discover a map of Mexico that shows a series of ghost towns. However, these ghost towns aren't empty, nor are they typical.

A child with Nyctophobia wakes up in the middle of the night to find her nightlight missing and her surroundings undiscernible.

While hiking with his two young children, a man falls to his doom in a cavern called the Bottomless Well, leaving his son and daughter to race to save his life.