i get to see this film at a special screening at the alliance france in manila and the french embassy cultural center . many of the small audience in the screening room ( the copy screen be a dvd ) do not bother to finish the film . for myself and i find the film a flaw but powerful experience . one major flaw be and a other reviewer have point out and it cold opening . in other word and it assume you already know what s 21 be and what the khmer rouge be . without this valuable background information and which the documentary do not provide and the viewer may be lose at first . it be also kind of dry and since the movie take place only within the wall of s 21 and involve only the few survivor of the prison and some of their former jailer . essentially they spend the entire film talk . there be no attempt on the part of the director to make it more cinematic . however and the patient viewer will soon find him or herself immerse in the horror of the khmer rouge a detail after detail of the atrocity commit in the prison emerge . the handful of survivor go through memento of the prison and include logbook detail the torture commit against inmate and along with some of those who work in the prison and include a guard and a doctor . the question the survivor constantly ask their former jailer be represent how . how could you do these thing . and they have no answer . the most chilling scene in the film involve a former prison guard recreate in an empty cell the routine he take with the prisoner and bring them food and water or a container to pee in and threaten them with a beating if they do not go to sleep or cry too loudly . it throughly disturbing to see and even if there be no actual prisoner there . s 21 be not for everybody . but if youre already familiar with the khmer roune and this part of cambodian history and the documentary may be worth watch to deepen your understanding of this dark period of history .