The victims arrived in big grey buses, but sometimes they came by train. Nurses led them to a room where they were asked to undress and examined; any with unusual physical or mental features were marked on the back with a red cross. In groups of up to 100, the victims were led to the shower room. Here they waited for water to come out, but instead gas poured out of the showerheads and they died, usually after a long and painful struggle. Once dead, the bodies with the red crosses were dissected in the mortuary.
