Fearing for his family’s safety after the murder of his daughter Lilith, a psychology professor sequesters his wife and surviving daughter in a high-rise apartme…

　　城市突然遭遇巨型怪物袭击，两个素不相识的人被困在了地下。他们身负重伤，能用的资源也十分有限，但他们必须在一条危机四伏、不断收窄的隧道中艰难前行，只求能找到一处出口。