Sonderkommando
For example, this note was found buried in the Auschwitz crematoria.  It was written by Zalman Gradowski, a Sonderkommando who was killed in the revolt on 7 October 1944:"Dear finder of these notes, I have one request of you ... that my days of Hell, that my hopeless tomorrow will find a purpose in the future.  I am transmitting [writing about] only a part of what happened in the Birkenau-Auschwitz Hell. You will realize what reality looked like ... From all this you will have a picture of how our people perished [died]."