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"The Walls Were Covered With Blood": I Witnessed WW2 Human Experiments | Inside Unit 731
Jun 9, 2026Episode 1 reveals Japan’s wartime biological weapons programme, Unit 731. Through rare survivor testimony and the account of Hideo Shimizu, one of the last living witnesses from the unit, it exposes a hidden world of human experiments carried out in the name of science.
Recruited as a teenager in the final months of WWII, Shimizu breaks decades of silence to describe what he witnessed inside the unit’s vast complex in Harbin, China, where prisoners became test subjects in lethal experiments. Through visits to former laboratories and testing grounds, the documentary uncovers how Japanese scientists developed biological weapons and launched germ attacks on Chinese civilians, with effects still felt today.
As Japan’s defeat loomed, Unit 731 pursued ever more desperate plans, including proposals to deploy biological weapons against the United States. This investigation traces the origins of one of wartime’s most secretive and disturbing programmes.


