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.

• Celador Films
• Northmen Productions
• Shauna Macdonald
• Natalie Mendoza
• Alex Reid
• MyAnna Buring
• Saskia Mulder
• Nora-Jane Noone
• Leslie Simpson
• Oliver Milburn