The weather can be very cold at Dachau concentration camp, but Dachau was apparently not cold enough for some Nazi purposes. A camp doctor named Rascher wrote to Heinrich Himmler in February 1943, asking to be transferred to Auschwitz to continue his experiments—which involved freezing live prisoners. The letter reads: “Auschwitz is more suitable [than Dachau] as it is colder there and the camp itself is much larger, thereby attracting less attention to the test persons, who tend to scream while freezing.”