The iron chains of the prisoner of war camp could not restrain Shen Jin's will. When the torture turned into a silent counterattack, he and the forbearing military doctor Zhou Xiao teamed up to detonate the enemy's ammunition depot and open a bloody path. Cui Jiu's hidden line, Ruan Qing's secret words, and Tietou's death squad formed an underground counterattack network. Escape is just the beginning - they want the entire defense line behind enemy lines to bury the three hundred compatriots who were subjected to live experiments.