Adventure horror thriller film starring Shauna Macdonald, Natalie Mendoza, Alex Reid, Saskia Mulder, Nora-Jane Noone, MyAnna Buring.

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.

Thrill seeker friends Sarah, Juno, and Beth whitewater raft together. Afterward, Sarah, along with her husband Paul and their daughter Jessica, are involved in a car accident when Paul is distracted. Paul and Jessica are killed, but Sarah survives.

One year later, Sarah, Juno, and Beth, as well as friends Sam, Rebecca, and newcomer Holly reunite at a cabin in the Appalachian Mountains of North Carolina for a spelunking adventure. The next day, they hike up to a mountain cave entrance and descend. While in the cave, Juno apologizes to Sarah for not being there for her after the accident, but Sarah is distant. After the group moves through a narrow passage, it collapses behind them, trapping them. After a heated discussion, Juno admits that she has led the group into an unknown cave system instead of the fully explored cave system that they had originally planned to visit, and so rescue is therefore impossible. She then tells Sarah that this adventure was in the hopes of restoring their relationship.

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