Sonderkommando Research

Sonderkommandos were work units of Nazi death camp prisoners, composed almost entirely of Jews, who were forced, on threat of their own deaths, to aid with the disposal of gas chamber victims during The Holocaust. The death-camp Sonderkommando, who were always inmates, should not be confused with the SS-Sonderkommandos which were ad hoc units formed from various SS officers between 1938 through 1945.
Sonderkommando members did not participate directly in killing; that responsibility was reserved for the guards, while the Sonderkommandos' primary responsibility was disposing of the corpses. They were forced into the position; in most cases they were inducted immediately upon arrival at the camp, and were not given any advance notice of the tasks they would have to perform. They had no way to refuse or resign other than by committing suicide. Because the Germans needed the Sonderkommandos to remain physically able, they were granted much less squalid living conditions than other inmates: they slept in their own barracks, which more than any other in the camp resembled normal human dwellings; they were allowed to keep and use various goods such as food, medicines and cigarettes brought by those who were sent to the gas chambers; and, unlike ordinary inmates, they were not subject to arbitrary, random killing by guards. As a result, Sonderkommando members tended to survive longer than other inmates of the death camps — but few survived the war.
Because of their intimate knowledge of the process of Nazi mass murder, the Sonderkommando were considered Geheimnisträger — bearers of secrets — and as such, they were kept in isolation from other camp inmates, except, of course, for those about to enter the gas chambers. Since the Nazis did not want Sonderkommandos' knowledge to reach the outside world, they followed a policy of regularly gassing almost all the Sonderkommando and replacing them with new arrivals at intervals of approximately 4 months; the first task of the new Sonderkommandos would be to dispose of their predecessors' corpses. Therefore since the inception of the Sonderkommando through to the liquidation of the camp there existed approximately 14 generations of Sonderkommando.