Stalag Luft III it as a longer third-person narrative under the title "The Wooden Horse", which was filmed as "The Wooden Horse" in 1950. He included many details omitted in his first book, but changed his name to "Peter Howard", Michael Codner to "John Clinton" and Oliver Philpot to "Philip Rowe". Williams also wrote a prequel, "The Tunnel", an extended study of the mentalities of life as a prisoner of war. Although not an escape novel, it shows the profound urge to escape, and explores the ways that camp life affected men's emotions. Paul Brickhill was an Australian-born Spitfire pilot, shot down in
Stalag Luft III to conceal the bulges from the sand, and were referred to as "penguins" because of their supposed resemblance. In sunny months, sand could be carried outside and scattered in blankets used for sun bathing; more than 200 were used to make an estimated 25,000 trips. The Germans were aware that something was going on but failed to discover any of the tunnels until much later. To break up an escape attempt, nineteen of the top suspects were transferred without warning to Stalag VIIIC. Of those, only six had been involved with tunnel construction. One of these, a Canadian called Wally