'We were not human beings any more'
Jewish Holocaust survivor Freddie Knoller, now in his 90s, managed to evade capture by the Nazis for much of World War Two, but was caught while fighting with the French Resistance in 1943.
Originally from Austria, he fled to Belgium when he was 17 and then went on to France, where he was captured and sent to Auschwitz concentration camp.
He talks about his registration at the camp and how he was tattooed on his forearm with the number 157108.
Find out more in Surviving the Holocaust: Freddie Knoller's War on Thursday 22 January at 21:30 GMT on BBC Two. Or catch up later on BBC iPlayer.