Inside Hitler's Secret Death Camp Caroline Sturdy Colls and her team carry out the first ever comprehensive forensic investigation of Treblinka. This revealing documentary follows a team of British archaeologists who have been granted unprecedented access to excavate and investigate one of Hitler’s most notorious extermination camps, 50 years after it was dismantled. Between 1942 and 1943, the Nazis murdered more than 800,000 people at Treblinka in north east Poland, brutally exploiting many more as slave labour. Today no visible traces of those atrocities remain. The Nazis dismantled the camp in 1943 in an attempt to conceal what had happened there. In the summer of 2013, British archaeologist Caroline Sturdy Colls led a team that carried out the first ever comprehensive forensic investigation of the camp’s remains. Her goal was to piece together the grim mechanics of industrialised slaughter that were used there, using a combination of forensic detective work, aerial surveys and, for the first time, archaeological digs. This film follows Caroline and the team as they get to work at Treblinka, uncovering the location and remains of the camp and detailing its key structures, including the processing rooms, gas chambers and burial pits. Drawing on testimony from one of the last survivors of the camp and newly-discovered documentary sources, the programme provides a new, visceral and compelling narrative of one of the darkest chapters in human history.