BERLIN, GERMANY—Wife-and-husband team Susan Pollock and Reinhard Bernbeck of Berlin’s Free University are excavating the Columbia Concentration Camp, operated by the Nazis between 1933 and 1936. The camp had been a military jail before it became a place to house and torture political opponents. “This was not just a place where people were terrorized and tortured, but a school of torture. The people who had been commanders of Columbia later turned into commanders of other concentration camps,” Bernbeck explained. An estimated ten thousand people were inmates at Columbia before it was razed and the Tempelhof Airport was built on the site. Excavations are being conducted now because further development of the site is being planned.