In 1939, Rascher transferred to the
SS with the rank of Private. That same year, Rascher denounced his father, and was conscripted into the
Luftwaffe. A relationship with and eventual marriage to former singer
Karoline "Nini" Diehl gained him direct access to
Reichsführer-SS Heinrich Himmler. Rascher's connection with Himmler gave him immense influence, even over his superiors. Though it is unclear as to the precise nature of Diehl's connection to Himmler, she frequently corresponded with him and interceded with him on her husband's behalf; it is suggested that Diehl may have been a former lover of Himmler's. A week after first meeting Himmler, Rascher presented a paper, "Report on the Development and Solution to Some of the Reichsfuehrer's Assigned Tasks During a Discussion Held on April 24, 1939". While taking a course in aviation medicine at Munich, he wrote Himmler a letter in which he said that his course included research into high-altitude flight and it was regretted that no tests with humans had been possible as such experiments were highly dangerous and nobody volunteered for them. Rascher asked Himmler to place human subjects at his disposal, stating quite frankly that the experiments might prove fatal, but that previous tests made with monkeys had been unsatisfactory. The letter was answered by
Rudolf Brandt, Himmler's adjutant, who informed Rascher that prisoners would be made available. Rascher subsequently wrote back to Brandt, asking for permission to carry out his experiments at Dachau, and plans for the experiments were developed at a conference in early 1942 attended by Rascher and members of the
Luftwaffe Medical Service. The experiments were carried out in the spring and summer of the same year, using a portable pressure chamber supplied by the
Luftwaffe. The victims were locked in the chamber, the interior pressure of which was then lowered to a level corresponding to very high altitudes. The pressure could be very quickly altered, allowing Rascher to simulate the conditions which would be experienced by a pilot freefalling from altitude without oxygen. After viewing a report of one of the fatal experiments, Himmler remarked that if a subject should survive such treatment, he should be "pardoned" to life imprisonment. Rascher replied to Himmler that the victims had to date been merely Poles and Soviets, and that he believed they should be given no amnesty of any sort. 80 out of the 200 subjects died outright because of the experiment and the rest were murdered. The experiments were conducted at Dachau after the high-altitude experiments had concluded. The purpose was to determine the best way of warming German pilots who had been forced down in the North Sea and suffered
hypothermia. Rascher's victims were forced to remain outdoors naked in freezing weather for up to 14 hours, or kept in a tank of icewater for three hours, their pulse and internal temperature measured through a series of electrodes. Warming of the victims was then attempted by different methods, most usually and successfully by immersion in hot water; at least one witness, an assistant to some of these procedures, later testified that some victims were thrown into boiling water for rewarming. Himmler attended some of the experiments, and told Rascher he should go to the North Sea region and find out how ordinary people there warmed victims of extreme cold. Himmler reportedly said he thought "that a fisherwoman could well take her half-frozen husband into her bed and revive him in that manner" and added that everyone believed "animal warmth" had a different effect than artificial warmth. Four
Romani women were sent from
Ravensbrück concentration camp and warming was attempted by placing the hypothermic victim between two naked women. In October 1942, results of the experiments were presented at a medical conference in
Nuremberg in two presentations named "Prevention and Treatment of Freezing", and "Warming Up After Freezing to the Danger Point". Rascher, who had by now been transferred to the
Waffen-SS, was eager to obtain the academic credentials necessary for a high-level university position. A
habilitation which was to be based on his research failed, however, at Munich, Marburg, and Frankfurt, due to the formal requirement that results be made available for public scrutiny. Similar experiments were conducted from July to September 1944, as the
Ahnenerbe provided space and materials to doctors at Dachau to undertake "seawater experiments", chiefly through
Wolfram Sievers. While working in Dachau, Rascher developed the standard cyanide capsules, which could be easily bitten through, either deliberately or accidentally.
Blood coagulation experiments Rascher experimented with the effects of
Polygal, a substance made from
beet and apple
pectin, which aided
blood clotting. He predicted that the preventive use of Polygal tablets would reduce bleeding from
gunshot wounds sustained during combat or during surgery. Subjects were given a Polygal tablet, and shot through the neck or chest, or their limbs amputated without anaesthesia. Rascher published an article on his experience of using Polygal, without detailing the nature of the human trials and also set up a company to manufacture the substance, staffed by prisoners. ==Personal life and execution==