September 3, 1941 - SS Doctors begin Selections of Prisoners - SS doctors arrive at Dachau to begin the regular selection of prisoners they judge to be too ill or weak to work. These prisoners will be transferred to Hartheim and killed there. Hartheim, in Austria, is a killing site where medical staff gas concentration camp prisoners as part of an operation code-named "Special Treatment 14f13." From January 1942 until November 1944, SS doctors will select more than 3,000 Dachau prisoners to be killed at Hartheim.
June 3, 1942 - Polish Priests Deported to Dachau - Almost 60 Polish priests and monks arrive at Dachau from the Auschwitz camp in occupied Poland. More than 2,700 clergy, mostly Catholic clergy from occupied Poland, are incarcerated in Dachau during the camp's existence. The Germans attempt to undermine the leadership of the Catholic Church in Poland as part of their plan to Germanize occupied Poland. The SS holds Catholic clergy together in Barrack 26, the so-called "Priest Barracks" in Dachau.
October 3, 1942 - Medical Experiments Conducted on Prisoners - SS doctor Sigmund Rascher reports to Heinrich Himmler that he has nearly concluded his freezing experiments on prisoners in Dachau. Rascher experimented with methods of reviving prisoners after they had been forced to remain in a tank of ice water for hours. The German air force wishes to find better methods of reviving pilots whose planes go down over cold water. To this end, about 300 prisoners were used against their will as test subjects. About one-third of them die as a result. Rascher and other SS doctors perform numerous dangerous medical experiments on prisoners at Dachau. These include high-altitude, malaria, and medication experiments.