We are standing in the notorious PoW camp Stalag Luft III, built at the height of the Third Reich, 100 miles east of Berlin. Ten thousand prisoners were kept under German guns here on a 60-acre site ringed with a double barbed-wire fence and watchtowers.
They slept in barrack huts raised off the ground so guards could spot potential tunnellers, but the Germans did not count on the audacity of British Spitfire pilot Squadron Leader Roger Bushell, played by Sir Richard Attenborough in the 1963 film. He was interned at the camp in March 1943. With him were about 2,000 other RAF officers, many of whom were seasoned escapers from other camps, with skills in tunnelling, forgery and manufacturing.