Newly released WWII documents shed light on Japan's notorious Unit 731 germ warfare program. The program, active from 1936-1945, conducted inhumane experiments on Chinese prisoners. A Chinese film detailing these atrocities faced postponement, sparking public outcry. A 95-year-old eyewitness, Hideo Shimizu, shared his experiences, while other researchers uncovered further evidence through newly released personnel rosters. The U.S. granted immunity to Unit 731 leaders in exchange for experimental data, a controversial decision that continues to fuel debate about wartime justice.

Prepared by Rachel Morgan and reviewed by editorial team.