just read this,
A book worth reading, Eyewitness Auschwitz by Filip Muller. he arrived there April 1942 and began working in the gassing installations and crematoria, he was still alive when the gassings ceased in November 1944, he is one of the few who saw the Jewish people die, and lived to tell about it. its available on Amazon, now this book is harrowing., he tells exactly what it was like working as a prisoner in the Sonderkommando.
interesting, a Lady who went to be a head teacher at a Jewish school, she refused to leave her pupils, even when being told it was dangerous, and she had to