A group of tired commuters have caught the last train home, ready to hop into their beds for the night. However, their train soon veers off-course and crashes into an abandoned tunnel. The three surviving commuters; withdrawn mother Yi Ling, her son Lucas, and student Janice, are forced to band together and survive the night, as well as avoid the mysterious monster hunting them. Yi Ling still suffers from flashbacks to the car accident that killed her husband and nearly took Lucas` life too. When Lucas is snatched away by the monster, her maternal instincts are tested, and Janice`s ideas of family are challenged as she remembers her difficult relationship with her estranged father. Back at the subway control headquarters, the engineers do their best to make sense of the situation and rescue the survivors. 新视觉影视理论电视剧在线观看-高清热播电影电视剧免费看尽在新视觉影视网-海量高清电影电视剧免费在线观看提供生死环线在线观看资源包括西瓜影音百度云，觉得生死环线这部影片不错的话，不要忘记分享噢
