Philosophy of a Knife is a 2008 Russian-American horror film written, produced, shot, edited, and directed by . It covers the Japanese Army's Unit 731, mixing archival footage, interviews, and extremely graphic reenactments of experiments performed there. The film is four hours long and is presented in two parts (Part one and Part two). It was shot in black and white and in English. The interviews are shot in color and have English subtitles.