Inside the gas chamber of Crematorium I.

"I estimate that at least 2.5 million victims were executed and exterminated there by gassing and burning, and at least another half million succumbed to starvation and disease making a total dead of about 3 million. This figure represents about 70-80% of all persons sent to Auschwitz as prisoners, the remainder having been selected and used for slave labor in the concentration camp industries; included among the executed and burned were approximately 20,000 Russian prisoners of war (previously screened out of prisoner-of-war cages by the Gestapo) who were delivered at Auschwitz in Wehrmacht transports operated by regular Wehrmacht officers and men. The remainder of the total number of victims included about 100,000 German Jews, and great numbers of citizens, mostly Jewish, from Holland, France, Belgium, Poland, Hungary, Czechoslovakia, Greece, or other countries. We executed about 400,000 Hungarian Jews alone at Auschwitz in the summer of 1944."
Rudolf Höss, commandant of Auschwitz 1940 -1943