Then Sievers watched a second freezing experiment. Himmler had instructed Professor Hirt of Strasbourg to have a look at Rascher’s work on freezing, since he (Himmler) obviously had come to the conclusion that Rascher alone was not sufficient for the clarification of these scientifically extensive and difficult questions. For this experiment a professional criminal was introduced whom a regular court had sentenced to death for robbery and murder. Sievers and Dr. Hirt made sure about this by examining the files of the criminal police department of the Dachau concentration camp. Dr. Hirt then asked the person to be experimented on whether he realized that the experiment might prove fatal to him. The person to be experimented on answered in the affirmative. By personally questioning the person to be experimented on, Sievers then made sure that he agreed to the experiment. The person in question answered in the affirmative and added: “If it does not hurt.” This assurance could be given since the experiment was carried out under full narcosis. Sievers did not take part in the entire experiment, but he saw that it was carried out under full narcosis. (_German Tr. pp. 5685-86._) The witness Dr. Punzengruber, at that time an inmate of the Dachau concentration camp and from 1942-1943 assigned to Dr. Rascher’s station as a chemist, confirms that the person used had been condemned to death. The same witness confirms that Sievers was not present during other freezing experiments. Dr. Punzengruber could establish this because his laboratory was located next to the room where Dr. Rascher carried out his experiments. (_Affidavit of Dr. Punzengruber, 14 March 1947._) A further presence of Sievers at freezing experiments has not occurred and has not been claimed from any side. In order to prove Sievers’ participation in the freezing experiments, the prosecution pointed out the following documents: Rascher’s letter of 10 September 1942 to Himmler. “SS Obersturmbannfuehrer Sievers, who observed the experiments in Dachau last week, is of the opinion that if during a convention there would be a report at all, I, too, would have to be called in for reporting.” (_NO-234, Pros. Ex. 83._) Himmler’s letter of 22 September 1942 to Rascher in which the former instructs Rascher to carry out experiments in quick increase of body temperature and increase of body temperature through medicaments and animal heat [medikamentanimalische Erwaermung], Sievers received a copy of this letter for information on 25 September 1942. (_1611-PS, Pros. Ex. 85._)