Out of an estimated 17,000 people imprisoned at Tuol Sleng, there were only seven known survivors. As of September 2011, only three of them are thought to be still alive: Chum Mey, Bou Meng and Chim Math. All three were kept alive because they had skills their captors judged to be useful. Bou Meng, whose wife was killed in the prison, is an artist. Chum Mey was kept alive because of his skills in repairing machinery. Chim Math was held in S-21 for 2 weeks and transferred to the nearby Prey Sar Prison. She may have been spared because she was from Stoeung district in Kampong Thom where Comrade Duch was born. She intentionally distinguished herself by emphasising her provincial accent during her interrogations. Vann Nath, who was spared because of his ability to paint, died in September 5, 2011.
Read more Genocide Museum Toul Sleng in English
P.S : You can view the original at the Genocide Museum. Free entrance for Khmers.