Maruta 2 Laboratory of the Devil 1992 In the spring of 1935, Japan established a secret base, Unit 731 in Manchuria, where many innocent Chinese, Korean and Mongolian people were killed in grotesque experiments An idealistic young doctor , Morishima, is horrified by the experiments being performed in the camp and when his fiancee arrives disguised as a Chinese prisoner he sets out to liberate the camp A docudrama sequel to the notorious Men Behind the Sun, which pulls no punches when it comes to delivering the shocks