The Japanese army's 731st unit is called the Japanese Kwantung Army in Manchuria 731st epidemic prevention and water supply unit, they pretended to study the prevention and treatment of disease and drinking water purification for the sake of the actual live people to carry out experiments on the effect of biological and chemical weapons, the experimental object at that time is mainly Chinese, Koreans and prisoners of war. 731st unit is also Japan in the Second World War, engaged in biological and bacteriological warfare research and human experiments related to the research of secret military medical units. Research of the secret military medical units, after the war, it was found that the bacterial stockpile of Unit 731 can be said to be incredibly large. Before the imminent defeat of Japan in World War II, in order to salvage the defeat, Unit 731 produced the so-called bacteriological weapons day and night, reaching a point of insanity, to the extent that it could even cultivate nearly 300 kilograms of bubonic plague virus every month, and what kind of concept is this? Let's put it this way, if these 300 kilograms are used to cultivate plague fleas, about 1 billion of them can be cultivated, and the cultivated plague virus is also 60 times more toxic than the original ordinary rat vaccine. You know, Unit 731, besides breeding these plague viruses, they also have two other different viruses, and the monthly production of these two viruses is also very amazing. And these viruses have also been used in actual combat, in 1939, a Japanese Kwantung Army and the Soviet Army, the Kwantung Army was at a disadvantage, in order to reverse the passive situation, the Japanese Army at that time sent a death squad carrying a variety of bacteriological weapons, and within a few days after the departure of the death squad, the Soviet Army stationed in the area of the frequent discovery of infectious disease outbreaks, resulting in the Soviet Union Army losses were heavy. After Japan's defeat, Japan will be scattered on the battlefield in China to develop bacteriological weapons equipment and information quickly transferred back to the country, but also did not come to the human experiments of the living people killed, all the experimental equipment all destroyed, and finally before leaving also blew up most of the buildings in an attempt to destroy the evidence to cover up their own committed unforgivable crimes.