Extermination camp
To keep people from panicking and fighting back, the Nazis told the prisoners they were going to shower and get deloused (get lice removed).  Prisoner Sonderkommando were forced to help in and around the gas chambers.  They encouraged the Jews to undress without a hint of what was about to happen.  (If the Sonderkommando warned the prisoners, they too would be killed.)  The gas chambers were designed to look like shower rooms (with fake water nozzles, and tile walls).  The Sonderkommando talked to the victims about life in the camp to keep people from getting suspicious.  They also helped the elderly and the very young to undress.  The Sonderkommando also comforted older children who might cry "because of the strangeness of being undressed in this fashion".