Using a range of geophysical surveying tools including ground penetrating radar, resistance survey, and electrical imaging, forensic archaeologist Caroline Sturdy Colls has laid to rest doubts about the existence of mass graves at the Treblinka death camp in Poland.

When the Nazis left Treblinka in 1943 they knocked down the buildings and levelled the earth, and even built a farmhouse and installed a Ukrainian "farmer" to cover up evidence that the death camp existed.

The existence of mass graves was known about from witness testimony, but the failure to provide persuasive physical evidence led some to question whether it could really be true that hundreds of thousands of Jews were killed here.

Geophysical surveys have revealed a number of pits across the site. Given their size and location, there is a strong case for arguing that they represent burial areas. As well as the pits, the survey has located features that appear to be structural, and two of these are likely to be the remains of the gas chambers.

Source: BBC News

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