22 January 2012 Updated at 19:19 ET
Treblinka: Revealing the hidden graves of the Holocaust
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Any doubts about the existence of mass graves at the Treblinka death camp in Poland are being laid to rest by the first survey of the site using tools that see below the ground, writes forensic archaeologist Caroline Sturdy Colls.
link-
http://www.bbc.co.uk/news/magazine-16657363