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 The three surviving commuters; withdrawn mother Yi Ling, her son Lucas, and student Janice, are forced to band together and survive the night, as well as avoid the mysterious monster hunting them.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. 　　译文(2): 一群疲惫的上班族赶上了最后一班回家的火车，准备上床过夜。然而，他们的火车很快偏离了轨道，撞进了一条废弃的隧道。三个幸存的通勤者: 内向的母亲依玲，她的儿子卢卡斯和学生珍妮丝，被迫团结在一起，度过了这个夜晚，同时也避开了追杀他们的神秘怪物。伊玲仍然在回忆那场车祸，那场车祸夺去了她丈夫的生命，也差点夺去了卢卡斯的生命。当卢卡斯被怪物抓走时，她的母性本能受到了考验，珍妮丝对家庭的看法受到了挑战，因为她还记得她与疏远的父亲之间的艰难关系。回到地铁控制中心，工程师们竭尽全力了解情况，营救幸存者。