The classic Steve McQueen movie immortalised three tunnels at Stalag Luft III PoW camp, now astonished archaeologists have discovered a fourth called George

It has lain hidden for nearly 70 years and looks, to the untrained eye, like a building site. But this insignificant tunnel opening in the soft sand of western Poland represents one of the greatest examples of British wartime heroism. And the sensational story became the Hollywood classic, The Great Escape, starring Steve McQueen.

Frank Stone, seated, with Dr Tony Pollard on the site of George

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