Mr. Him Huy was called as a witness to testify on the functioning of S-21.
A Khmer rouge soldier since 1972 or 1973, Him Huy started to work at S-21 as a guard in late 1976. There he became part of the special unit operating under the defence unit and was responsible for the arrest and transfer of detainees. With the intensification of internal purges at S-21, he was promoted to Deputy Chief of the special unit in charge of security matters at S-21 in 1977. He claims that he was transferred to build dykes in the rice fields at Prey Sar in 1978.