Extermination
Arriving by train, victims were pulled from the train, separated by sex, and ordered to strip naked. In winter, the temperature often dropped to –20 °C (–5 °F). The guards chose who would go to the "infirmary." Jews who were too resistant to the process were taken to the infirmary and shot. Women had their hair cut off before going into the gas chamber. This hair was used "in the manufacture of hair-yarn socks for 'U'-boat crews and hair-felt foot-wear for the Reichs-railway", to quote from a directive sent to all concentration camp commanders in 1942.
The newly arrived Jews, particularly the men, were beaten incessantly with whips in order to drive them towards the gas chambers. According to testimony of SS officers, men were always gassed first from the transports, while women and children waited outside the gas chamber for their turn. During this time, the women and children could hear the sounds of suffering from inside the gas chamber, and they became well aware of the fate that awaited them, which naturally caused panic and distress, and involuntary defecation.
An entire train transport of people could be killed in a matter of two or three hours.
Read more about this topic: Treblinka Extermination Camp