The Japanese went crazy and even their own people were not let go, and they heard that their 731 unit not only took prisoners of war to do human experiments, but also used young soldiers in Japan as experimental objects. These young soldiers were forced to use their bodies as experimental subjects, injected with and exposed to various types of bacteria, viruses and gases, which were used to test the effects of various biological and chemical weapons. Many teenage soldiers suffered serious physical injuries and even death as a result. There is no humanity at all.