In a southwestern province, an isolated state-owned machinery factory built during the Third Front construction era.
Deep underground lies a sinister, terrifying ancient city.
Several mysterious strangers suddenly arrive and lead Feng Zheng and Liu Weihong, security officers in the security department of Zijang Machinery Factory, into an excavation from more than twenty years ago. What horrifying, ghastly history is hidden in an underground trench filled with dismembered bodies? The underground city incident at Factory 8030… The terrifying truth is about to emerge.
