Müller recounts what prisoners said to him, and describes the experience of personally going into the gas chamber: bodies were piled up by the doors "like stones". He breaks down as he recalls the prisoners starting to sing while being forced into the gas chamber. Accounts include some from local villagers, who witnessed trains heading daily to the camp and returning empty; they quickly guessed the fate of those on board. Lanzmann also interviews bystanders. He asks whether they knew what was going on in the death camps. Their answers reveal that they did, but they justified their inaction by the fear of death. Two survivors of Chełmno are interviewed: Simon Srebnik, who was forced to sing military songs to entertain the Nazis; and Mordechaï Podchlebnik. Lanzmann also has a secretly filmed interview with Franz Schalling, a German security guard, who describes the workings of Chełmno. Walter Stier, a former Nazi bureaucrat, describes the workings of the railways. Stier insists he was too busy managing railroad traffic to notice his trains were transporting Jews to their deaths. The Warsaw ghetto is described by Jan Karski, a member of the Polish Underground who worked for the Polish government-in-exile, and Franz Grassler, a Nazi administrator in Warsaw who liaised with Jewish leaders. A Christian, Karski sneaked into the Warsaw ghetto and travelled using false documents to England to try to convince the Allied governments to intervene more strongly on behalf of the Jews. Memories from Jewish survivors of the Warsaw Ghetto uprising conclude the documentary. Lanzmann also interviews Holocaust historian Raul Hilberg, who discusses the significance of Nazi propaganda against the European Jews and the Nazi development of the Final Solution and a detailed analysis of railroad documents showing the transport routes to the death camps. The complete text of the film was published in 1985. Corporal Franz Suchomel, interviewed by Lanzmann in Germany on 27 April 1976, was an SS officer who had worked at Treblinka. Suchomel agreed to be interviewed for DM 500, but he refused to be filmed, so Lanzmann used hidden recording equipment while assuring Suchomel that he would not use his name. Documentary maker Marcel Ophüls wrote: "I can hardly find the words to express how much I approve of this procedure, how much I sympathize with it." Suchomel talks in detail about the camp's gas chambers and the disposal of bodies. He states that he did not know about the extermination at Treblinka until he arrived there.