Paris, the 1980s. Three students decide to celebrate their graduation with a visit of the Paris catacombs. But something, someone, is hunting them. Trapped deep underground, the group needs to get out before it’s too late...

有个老头去看医生，告诉医生他的肠胃有问题。医生问他：“你的大便规律吗？”“很规律，每天早上八点钟准时大便。”“那你还有什麽问题？”“问题是，我每天早上九点钟才起床。”