第2集完结

剧情：《地下长城》一九六九年六月，人们在安徽省亳州市挖掘防空洞时，一条神秘的古地道突然出现在大家的面前。这条地道砖砌工整，没有尽头，好似一座地下谜城，由于是曹操的故里，亳州市的人们祖祖辈辈对曹操充满了敬畏。这条地道会不会与曹操有关呢？

正片

剧情：《地球未知档案：杀手机器人》Artificial intelligence is infiltrating every level of the armed forces, from infantry on the front lines to command centers conducting global-scale operations. A terrifying behind-the-scenes look at this high-stakes issue, following military-funded scientists racing to build this technology and ethicists scrambling to awaken the world to its apocalyptic potential.