We’ve heard about the Russian gulags and the Nazi death camps of WWII. However, perhaps the most gruesome atrocities that mankind has ever carried out on their fellow man was the nightmares that took place within Japan’s Unit 731. From Wiki:
Prisoners, including one known POW, were subjected to vivisection without anesthesia. Vivisections were performed on prisoners after infecting them with various diseases. Researchers performed invasive surgery on prisoners, removing organs to study the effects of disease on the human body. These were conducted while the patients were alive because it was feared that the decomposition process would affect the results. The infected and vivisected prisoners included men, women, children, and infants.
Prisoners had limbs amputated in order to study blood loss. Those limbs that were removed were sometimes re-attached to the opposite sides of the body. Some prisoners’ limbs were frozen and amputated, while others had limbs frozen, then thawed to study the effects of the resultant untreated gangrene and rotting.
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