Once they got off the train at Auschwitz I, they formed a line where a guard would determine their fate. If they seemed fit to work, they were sent to the actual showers where they prepared for life at the concentration camp. If they seemed fragile, were pregnant, had children, etc they were sent to the gas chambers.
Almost immediately after they got off the train and felt a sense of relief - that was taken away from them. I didn't take pictures of the gas chambers because of the emotions I felt during and I didn't feel like it was necessary to document the place of this heinous crime.
These people, who escaped to what they thought was a better place, were lined up in a single file line and told to undress and get ready to shower. Once undressed, they entered the chamber and the vents that they thought were for the shower seeped out Zyklon B (a highly lethal pesticide.) Later, a crematorium was designed in the Birkenau camp and was labeled a 'killing factory'.