HARBIN, Aug. 15 (Xinhua) -- A roll of a Japanese chemical warfare unit was revealed for the first time in China on Monday.

The document contains the real names and personal information of 414 members of Unit 516, which was set up by the Japanese army in May 1939 in Qiqihar City of northeast China's Heilongjiang Province, according to the Exhibition Hall of Evidences of Crime Committed by Unit 731 of the Japanese Imperial Army in Harbin, Heilongjiang's capital.

As the base camp of Japan's chemical warfare, Unit 516 developed a range of toxic agents and used them during warfare.

The document was originally held by the Ministry of Health, Labor and Welfare of Japan and then collected by the National Archives of Japan. A photocopy was obtained by a research team of the Exhibition Hall of Evidences of Crime Committed by Unit 731 of the Japanese Imperial Army in April 2021.