Agroupoftiredcommutershavecaughtthelasttrainhome, readytohopintotheirbedsforthenight.However, theirtrainsoonveersoff-courseandcrashesintoanabandonedtunnel.Thethreesurvivingcommuters;withdrawnmotherYiLing, hersonLucas, andstudentJanice, areforcedtobandtogetherandsurvivethenight, aswellasavoidthemysteriousmonsterhuntingthem.YiLingstillsuffersfromflashbackstothecaraccidentthatkilledherhusbandandnearlytookLucas`lifetoo.WhenLucasissnatchedawaybythemonster, hermaternalinstinctsaretested, andJanice`sideasoffamilyarechallengedassheremembersherdifficultrelationshipwithherestrangedfather.Backatthesubwaycontrolheadquarters, theengineersdotheirbesttomakesenseofthesituationandrescuethesurvivors.
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