Introduction: This film tells the story of Brother Dao, Gao Fei, Han Xiao and others in a city's ring-line subway, who suffered a bizarre accident. After falling into the depths of the ground, they were attacked by a huge monster. In order to escape, everyone was very flustered at first, and it was not until their teammates were killed one by one that they came to their senses, united as one, fought the monsters together, and finally managed to escape.
