(JNS.org) An Israeli and Polish team of archaeologists unearthed one of the main gas chambers at the Sobibor concentration camp, the Yad Vashem Holocaust research center announced last week. Located in eastern Poland, Sobibor was operated by the Nazis during the Holocaust from April 1942 to October 1943, during which time an estimated 250,000 Jews were murdered there. But after an uprising that saw several hundred Jewish prisoners try to escape, the Nazis closed the camp and bulldozed it in an attempt to erase its evidence.