一座修建十年的隧道即将竣工之际，受全球地质变动影响，地裂、地震、山体滑坡、泥石流等一系列地质灾害呼啸而至，隧道与整个县城危在旦夕，“老洪”洪赟兵（黄志忠 饰）、“小洪”洪翼舟（朱一龙 饰）父子俩于绝境处挺身而出，他们如何与16万人度过这场生死危机？
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