The ghettos, and the slow death they brought, were only part of the overall plan. In the months following the Wannsee Conference, three specialized killing centers, Belzec, Treblinka and Sobibor, were constructed in southeast Poland, featuring large gas chambers with adjacent crematories or burial pits for the disposal of corpses. After they became operational, the ghettos were bypassed and Jews went directly by train to the new death camps.
Lengyel described how Dr. Mengele would take all the correct medical precautions while delivering a baby at Auschwitz, yet only a half hour later, he would send the mother and baby to be gassed and burned in the crematorium. Lengyel herself was selected for the gas chamber, but managed to break away from the group of women who had been selected, before the truck arrived to take the prisoners to the crematorium.