Survivor Testimony About Treblinka Death Camp in September 1942. One of the few chosen for slave labor in the camp, he personally witnessed the murder of thousands of Jews in the gas chambers of Treblinka. Forced to dispose of the bodies, he witnessed every part of the extermination process in Treblinka. Escaping during the revolt in the camp on August 2, 1943, Eliyahu Rosenberg gives testimony here about the gas chambers and process of mass murder in Treblinka, a place where over 13 months, approximately 870,000 Jews were murdered.