“Evil Unbound,” a film about Unit 731, held its world premiere on Wednesday in Harbin, where this notorious Japanese germ warfare unit was once based, highlighting the atrocities committed by Japanese invading forces in China in World War II.

The movie tells the story of Wang Yongzhang, a local vendor, and others imprisoned in the “special prison” of Unit 731, where they were lured by false promises of freedom in return for cooperating with supposed health checks and disease prevention research, only to become victims of horrific medical experiments, including frostbite tests, gas exposure and vivisection.