Unit 731 was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army.

With an estimated death toll from 200,000 to 400,000 from biological warfare alone with over 3,000 more from experiments and 10,000 more of just prisoners and there is no record of any survivors.

The experiments that they used on their subjects included disease injections, controlled dehydration, hypobaric chamber experiments, biological weapons testing, vivisection, amputation and weapons testing.

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