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S-21: The Khmer Rouge Killing Machine is a 2003 film by Rithy Panh, a Cambodian-born, French-trained filmmaker who lost his family when he was 11. The film features two Tuol Sleng survivors, Vann Nath and Chum Mey, confronting their former Khmer Rouge captors, including guards, interrogators, a doctor and a photographer. The focus of the film is the difference between the feelings of the survivors, who want to understand what happened at Tuol Sleng to warn future generations, and the former jailers, who cannot escape the horror of the genocide they helped create.