123Movies. Japanese imperialism launched the September 18th Incident in China, and the criminal guns and guns were stained with the blood of the Chinese people. Simultaneously with the armed aggression, a bacteriological unit code-named 731 was established along the Su-Manchu border. They inhumanly used the Chinese, Koreans, and Soviets to carry out brutal experiments on living bodies, and committed horrific brutality in concentration camps, occupied areas, and prisoner-of-war camps; massacres, perverted adultery and humiliation, poison gas and bacteria experiments , sex experiments, etc...