Jin Chengmin – SANGHA KOMMUNE (SSR)

People visit an exhibition on historical facts of trials of Japanese war criminals at the Exhibition Hall of Evidences of Crime Committed by Unit 731 of the Japanese Imperial Army in Harbin, northeast China's Heilongjiang Province, July 1, 2026. (Xinhua/Zhang Tao)

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Having made more than 30 research trips to Japan and carried out interviews with former Unit 731 members, he has preserved over 400 hours of oral video archives, more than 20,000 criminal relics and 300,000 pages of original historical documents.

The book’s title carries two core implications, Jin explained. It symbolizes the classified core secrets and deadly human experimentation chambers of Unit 731, as well as the post-war backroom deal — the United States acquired the Japanese unit’s germ warfare data in exchange for covering up its heinous crimes.

This year marks the 81st anniversary of the victory in the Chinese People’s War of Resistance against Japanese Aggression and the World Anti-Fascist War, the 80th anniversary of the opening of the Tokyo Trials, and the 77th anniversary of the 1949 Khabarovsk War Crimes Trials.

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The document also recorded that four members aged 15 to 21 were sent to a Harbin-based medical university in the puppet “Manchukuo” for three years of “medical training” as military family students.”This is key information showing the joint training of young soldiers by the Japanese military, government and medical institutions, and once again proves that the implementation of human experiments and germ warfare was a top-down, organized, premeditated, and systematic group crime of Japanese militarism,” said Jin Chengmin, curator of the exhibition hall.Unit 731 was a top-secret biological and chemical warfare research base established in Harbin as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.At least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan’s biological weapons.

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“The new display further shapes up an evidence chain of the germ research and human experiments conducted by Unit 731,” said Jin.

Among them is a roster of the unit affiliated with the Japanese Kwantung Army, showing Unit 731 had a total of 3,497 members.

At least 3,000 people died at the unit’s base in Harbin alone between 1939 and 1945, mostly in experiments for the development of biological weapons.

In more than 30 years of archaeological excavations and research, the museum has collected nearly 100,000 pieces of artifacts and historical documents in seven categories.

“By presenting the evidence and disclosing the crimes, we enhance the international influence of the museum to remind the public of the past and safeguard peace. It’s not only important for Chinese but also meaningful for all humanity,” said the curator.