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he has preserved over 400 hours of oral video archives, more than 20,000 criminal relics and 300,000 pages of original historical documents.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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Shimizu Hideo offers apology in front of an apology and anti-war monument at the former site of Unit 731 in Harbin, northeast China’s Heilongjiang Province, Aug. 13, 2024. Shimizu, a former member of Unit 731, the notorious Japanese germ-warfare detachment during World War II, identified the crimes of the Japanese army on Tuesday at the site where he served 79 years ago in China. Shimizu, 94, was among the last batch of Unit 731 Youth Corps members sent by Japan to Harbin, China, where he spent more than four months witnessing the war crimes committed by the unit, including the cultivation of pathogens, human dissections and human experiments. He fled China with the retreating Japanese forces on August 14, 1945. This visit is Shimizu’s first return to Chinese soil in 79 years.

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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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“According to the data, the hospital was an extension of the medical crime of Unit 731. It was closely related to Japanese germ warfare since the beginning of its preparation, and was an important participant and associate of such warfare,” Jin said.

“The study found that human experiments and germ warfare carried out by Unit 731 were assisted by Japanese wartime medical institutions,” said Jin Chengmin, curator of the exhibition hall.

“This once again proves that the Japanese invasion of China was a top-down, organized and planned group crime carried out by Japanese militarism,” he added.

Unit 731 was a top-secret biological and chemical warfare research base established in Harbin as the nerve centre for Japanese biological warfare in China and Southeast Asia during World War II.