Prisoners of War in Stalag Luft III, made famous in the film The Great Escape, dug over 100 tunnels in a bid for freedom, archaeologists have discovered. The film portrays three tunnels at the camp in Zagan, in modern-day Poland, being used for a mass break-out. In March 1944, 76 prisoners escaped but only three made it to Allied and neutral countries and 50 were executed. Radar was used by Keele University and UCL archaeologists to identify the escape routes.