The latest stories and articles on Unit 731, a covert military unit of the Imperial Japanese Army, based in the Pingfang District of Harbin, Manchukuo, now Northeast China. Its primary mission was biological and chemical warfare research and development. Active from 1936 to 1945, the unit engaged in lethal human experimentation, including vivisection and disease injection, on prisoners. Unit 731 is infamous for its horrific war crimes and atrocities, leading to thousands of deaths. Its personnel received immunity from prosecution post-war in exchange for their research data.