re: Found this WWII government produced film about the death camps. Death Mills.

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Neither the Jewish religious leaders in Poland nor the authorities allowed archaeological excavations at the camp out of respect for the dead. Approval for a limited archaeological study was issued for the first time in 2010 to a British team from Staffordshire University using non-invasive technology and Lidar remote sensing. The soil resistance was analyzed at the site with ground-penetrating radar.[210] Features that appeared to be structural were found, two of which were thought to be the remains of the gas chambers, and therefore the study was allowed to continue.[211]

The archaeological team performing the search discovered three new mass graves. The remains have been reinterred out of respect for the victims. At the second dig they unearthed the first physical evidence of the gas chambers. The findings consisted of yellow tiles stamped with a Star of David for the Jewish-style bathhouse, and the building foundations with a wall. The Star was a logo of the ceramics factory founded by Jan Dziewulski and brothers Józef and Wladyslaw Lange (D?L since 1886) nationalised under communism after the war.[212][213] As explained by forensic archeologist Caroline Sturdy Colls, the importance of the new evidence is paramount because the second gas chambers built at Treblinka were housed in the only brick building in the entire camp; thus, it provides the first physical evidence for their existence.[214] The new discoveries became a subject of the 2014 documentary by the Smithsonian Channel.[215] More forensic work has been planned.[216]

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