Letter from SS-Sturmbannführer Brandt to SS-Obersturmbannführer Sievers, March 21, 1942. (Trials of War Criminals Before the Nuernberg Military Tribunals - Washington, U.S Govt. Print. Off., 1949-1953, Vol. I, p. 144):
"Reference is made to the sub atmospheric pressure experiments which are being carried out on concentration camp inmates in the Dachau camp by the air force. The Reich Leader-SS has approved the experiments under the conditions that SS-Untersturmführer Dr. Rascher who is an Obersturmführer in the air-force, will take part in them."
Letter from SS-Untersturmführer Dr. Rascher to SS-Sturmbannführer Rudolph Brandt, October 3, 1942. ( Trials of War Criminals Before the Nuremberg Military Tribunals - Washington, U.S Govt. Print. Off., 1949-1953, Vol. I, p. 221-222):
Reich leader SS wants to be informed of the state of the experiments. I
can announce that the experiments have been concluded, with the
exception of those on warming with body heat. The final report will be
ready in about 5 days. Prof. Holzloehner, for reasons I cannot fathom,
does not himself want to make the report to the Reich Leader Himmler and
has asked me to attend to it. This report must be made before 20 October,
because the great Luftwaffe conference on freezing takes place on
Nuremberg on 25 October. The report on the results of our research must
be made there, to assure that they be used in time for the troops.