In this supernatural mystery, The Grudge meets Saw, an amnesiac girl wakes up in what appears to be an abandoned jail, where she is haunted by spirits who want to torture her.
Unit 731 , officially known as the Manchu Detachment 731 and also referred to as the Kamo Detachment and the Ishii Unit, was a secret research facility operated by the Imperial Japanese Army between 1936 and 1945. It was located in the Pingfang district of Harbin, in the Japanese puppet state of Manchukuo, and maintained multiple branches across China and Southeast Asia.