A crack team of engineers and archaeologists join forces with some of the original survivors to unearth, for the first time, the secrets of the most famous wartime escape in history. On the night of 24th March 1944 76 allied airmen escaped from the North Compound of Stalag Luft III, a supposedly "escape-proof" POW camp in what is now Western Poland. This was the "Great Escape", one of the most iconic and thrilling stories in military history, immortalized in the Hollywood blockbuster. The real men behind the escape came from just about every allied country and were among the elite—daring pilots and flight officers trained to take the initiative and use their intelligence and cunning. The tunnel they dug was an engineering marvel nicknamed "Harry". It was 7 metres deep, more than 100 metres long, and took a year to complete. For nearly 70 years the tunnel has remained undisturbed – and with it the final secrets of the remarkable story of the Great Escape. Until now...