讲述一对从小一起长大的好友曼努(Schoenaerts)和迪斯(Kateb)长大后分道扬镳，曼努加入了犯罪世界，而迪斯成为了一名警察。当两人的世界再次交集，这对昔日好友又将如何面对彼此？

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...