
Unearthed:  The entrance to the tunnel, which lay untouched for  almost seven decades
 But at last British archaeologists have  excavated it, and discovered its remarkable  secrets.
Many of the bed boards which had been joined  together to stop it collapsing were still in position.  And the ventilation shaft, ingeniously crafted from used  powdered milk containers known as Klim Tins, remained in  working order. Scattered throughout the tunnel, which is  30ft below ground, were bits of old metal buckets,  hammers and crowbars which were used to hollow out the  route.
A total of 600 prisoners worked on three tunnels  at the same time. They were nicknamed Tom, Dick and  Harry and were just 2ft square for most of their  length.
It was on the night of March 24 and 25, 1944,  that 76 Allied airmen escaped through Harry. Barely a  third of the 200 prisoners – many in fake German  uniforms and civilian outfits and carrying false  identity papers – who were meant to slip away managed to  leave before the alarm was raised when escapee number 77  was spotted.

Tunnel vision: A tunnel reconstruction showing the trolley system, tried out, below, by Frank, 89
Bitter-sweet memories: Gordie King, 91, made an emotional return to Stalag Luft III. Only three made it back to Britain. Another 50 were executed by firing squad on the orders of Adolf Hitler, who was furious after learning of the breach of security. In all, 90 boards from bunk beds, 62 tables, 34 chairs and 76 benches, as well as thousands of items including knives, spoons, forks, towels and blankets, were squirrelled away by the Allied prisoners to aid the escape plan under the noses of their captors. Although the Hollywood movie suggested otherwise, no Americans were involved in the operation. Most were British, and the others were from Canada, (all the tunnellers were Canadian mining personnel) Poland, New Zealand, Australia, and South Africa, (as was Big X, the leader).

Discoveries: The site of the tunnel, recently excavated by British archaeologists

 The latest dig, over three weeks in August,  located the entrance to Harry, which was originally  concealed under a stove in Hut 104. The team also found  another tunnel, called George, whose exact position had  not been charted. It was never used as the 2,000  prisoners were forced to march to other camps as the Red  Army approached in January 1945. Watching the excavation  was Gordie King, 91, an RAF radio operator, who was  140th in line to use Harry and therefore missed out.  ‘This brings back such bitter-sweet memories,’ he said  as he wiped away tears. ‘I’m amazed by what they’ve  found.’