Freezing and hypothermia experiments, conducted for the Nazi high command, simulated the conditions that the armies might suffer on the Eastern Front. Because German forces were ill prepared for the bitter cold, thousands of German soldiers died of freezing or were debilitated by cold injuries.

The experiments were conducted under the supervision of Dr. Sigmund Rascher at Birkenau, Dachau and Auschwitz . Dr. Rascher reported directly to Himmler. Dr. Rascher publicized the results of his freezing experiments at the 1942 medical conference entitled "Medical Problems Arising from Sea and Winter".

The freezing experiments were divided into two parts. First, to establish how long it would take to lower the body temperature to death and second how to best resuscitate the frozen victim.

The two main methods used to freeze the victim were to put the person in a icy vat of water or to put the victim outside naked in sub-zero temperatures. The icy vat method proved to be the fastest way to drop the body temperature. The selections were made of young healthly Jews or Russians. They were usually stripped naked and prepared for the experiment. A insulated probe which measured the drop in the body temperature was inserted into the rectum. The probe was held in place by a expandable metal ring which was adjusted to open inside the rectum to hold the probe firmly in place. The victim was then placed in the vat of cold water and started to freeze. It was learned that most victims lost consciousness and died when the body temperature dropped to 25 C.

Two Russian men were seen by a prisoner doctor in the cold vat. They were very strong men and had said a comment to the SS doctor performing the experiment. The prisoner doctor was shocked at how long the Russian men could take the cold without loosing consciousness. He asked the directing doctor to take them out of the tank. He did not allow this and increased the temperature slightly to prolong their pain. They died after a long painful stay in the tank. The second way to freeze a victim was to strap them to a stretcher and place them outside naked. The extreme winters of Auschwitz made a natural place for this experiment.

The resuscitation or warming experiments were just as cruel and painful as the freezing experiments.