Gas chambers were made up of a concrete structure with a metal door that was air tight so no gas would escape, and no Jew would either. The gas used for killing Jews was a mixture of hydrogen cyanide a eye irritant, it made it so the Jew couldn't breathe so they would die from suffocation. After waiting about 20 minutes the German forces would then take the bodies elsewhere and bring in a new group of Jews.
In November 1944, the Russians marched into Auschwitz to see a horrible sight, at the camp many buildings had been demolished and about 7,000 Jews who were too weak to walk or even too sick to walk, they also saw about 600 corpses, and 8.5 tons of human hair many soldiers said that the smell coming from the camp was so horrid that some had to stop. Grown Russian men fell to their knees and wept for the Jews who were too emaciated to to move and were left for dead. Auschwitz was named a UNESCO World Heritage site in 1947, so all can remember those Jews were able to endure to the