It was a secret Japanese military unit that used Chinese prisoners for gruesome medical experiments.
In the gruesome world of Unit 731 of the Japanese Imperial Army, experiments with frostbite on human subjects became a favourite in a macabre litany of cruelty. Throughout the 1930s and '40s, until the end of World War II, the secret unit used Manchuria as a killing field. It was a case of science gone truly mad for the greater glory of the divine Emperor and Japan.
