We are saddened to hear of the recent passing of Selma Engel, who, after becoming one of the few people to escape Sobibor death camp in Poland during the Holocaust, immediately began telling the world what she saw. She was 96.

In spring 1944, after losing nearly his entire family on the day they arrived at Auschwitz II-Birkenau, 22-year-old Dario Gabbai was assigned to one of the special units of Jewish prisoners required to work in the gas chambers and crematoria: the Sonderkommando.