Riese. The biggest project of Nazi Germany. Today, a tourist attraction in the Owl Mountains. Five people decide to visit it, completely unaware of the tragedy that is about to happen to them. While exploring the tunnels, an earthquake occurs and ceilings collapse, cutting tourists off from the world and depriving them of any chance of rescue. They do everything to survive. They slowly realize that they may be the only survivors of the cataclysm.
—G