China Exposes Horrors of Japan's Unit 731: Biological Warfare and Human Experiments

China has released new evidence detailing atrocities carried out by Japan's Unit 731 during World War II. The unit, responsible for developing biological warfare, also conducted brutal human experiments on thousands of victims.

The findings highlight crimes that included the use of plague-infected animals and vivisections on live subjects.

Unit 731 was a covert Japanese military group that specialised in biological warfare. Its members performed experiments on at least 3,000 people, many of whom died from infections, dissections, or exposure to deadly pathogens. Civilians in China and the Soviet city of Khabarovsk were among those targeted by the unit's weapons.

In December 1949, the Khabarovsk War Crime Trials took place, often called the 'second Nuremberg trial.' A Soviet tribunal convicted 12 high-ranking Japanese scientists and officers from Unit 731. Sentences ranged from two to 25 years of forced labour, though most were released by 1956 following diplomatic talks between Japan and the USSR.

Hideo Sato, a former Unit 731 member, later admitted to operating on plague-infected animals to weaponise the disease. The trials received little global attention at the time, overshadowed by Cold War politics. Historical records now estimate that over 300,000 Chinese civilians died from Japan's biological attacks.

The newly unveiled evidence reinforces the scale of Unit 731's crimes. The Khabarovsk trials remain the only legal proceedings focused solely on biological warfare offences. Most of those convicted served only a fraction of their sentences before returning to Japan.