A tough, working-class petty criminal is drawn into the treacherous world of diamond smuggling and morphs into an anti-heroine to be reckoned with in the murky underworld.
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.