A group of seven friends head up into the mountains for a weekend of sun and fun. Their destination: a remote, luxury cabin hidden down a single track road, deep in the forest and miles from the nearest town. Shortly after arriving, they stumble across an abandoned mine and decide to explore the dark and claustrophobic tunnels. As the group hikes deeper into the mine, they make a shocking discovery that quickly turns their excitement into pure fear. Disorientated, confused and shaken to the bone, they are faced with a stark choice: work out what is happening in the mine, or let a mysterious force claim their lives.