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Unit 731: The Darkest Chapter of World War II That Went Unpunished By : Vijesh Nair Date : 24/01/2026 Investigation Journalism In 1941, as the world was consumed by the fires of World War II, Imperial Japan was running one of the most horrific scientific programs in modern history. Hidden in occupied Manchuria, China , a secret division of the Japanese Army— Unit 731 —conducted brutal biological and chemical warfare experiments on live human beings . Men, women, and even children were used as test subjects. Most were Chinese civilians, but Russians, Koreans, and Allied prisoners of war were also among the victims. These people were deliberately infected with plague, cholera, anthrax, and typhoid , frozen alive to study hypothermia, dissected without anesthesia, and exposed to chemical weapons—all in the name of “science.” Science Built on Human Suffering Unit 731 was led by General Shirō Ishii , a military doctor who believed that biological weapons could decide future wars. The vi...