The Exhibition Hall of Evidences of Crime Committed by Unit 731 of the Japanese Imperial Army on Thursday released a 38-minute video featuring a former member of Unit 731, the notorious Japanese germ-warfare unit during World War II.

In the footage, former Unit 731 member Tsuruo Nishijima described how the unit used meteorological data to conduct bacterial dispersal and frostbite experiments.

The video was recorded in 1997 by Japanese scholar Fuyuko Nishisato and donated to the exhibition hall in 2019, the hall said. The hall was built on the former site of Unit 731's headquarters in Harbin, the capital of northeast China's Heilongjiang Province.