Soon after Hitler ordered the invasion of Hungary in March 1944, the Nazis began rounding up hundreds of thousands of Hungarian Jews. Most were immediately sent to their deaths in the concentration camps at Auschwitz-Birkenau. David Gur was a member of the Jewish Hungarian underground, who helped produce tens of thousands of forged identification documents. These allowed Jews to hide their true identities and escape deportation to the death camps. Now 91 years old, David has been telling Mike Lanchin about his part in one of the largest rescue operations organised by Jews during the Holocaust.Photo: False Hungarian ID document (BBC)