The British glider, designed by Bill Goldfinch and Tony Rolt who learned the concepts of aerodynamics by borrowing a book about it from the camp library. Work on the "Colditz Cock" project involved almost a quarter of all the British prisoners, and construction was carried out in the attic above the chapel. The plan was to knock a hole through the exterior wall and then launch the glider off the roof. Both men agreed that it was the perfect place from where the launch a glider. It was never discovered by the Germans, but unfortunately it was not completed before the arrival of the liberating American soldiers in April 1945 and so its air-worthyness was not put to the test. Many years later, however, a television programme ordered the reconstruction of the glider from the original plans, and much to their delight it flew quite beautifully.