Peter Butterworth beyond the camp grounds. He was subsequently sent to Stalag Luft III, near Sagan, the scene of "The Great Escape". Whilst at Stalag Luft III he met Talbot Rothwell, who later went on to write many of the Carry On films in which Butterworth was to star. Rothwell and Butterworth formed a duet and sang in the camp shows, where booing and catcalls covered the sounds of an escape tunnel being dug by other prisoners. Butterworth was one of the vaulters covering for the escapers during the escape portrayed by the book and film "The Wooden Horse". Butterworth later auditioned
Stalag Luft III and escape equipment. As this escape attempt was unprecedented in size, it would require unparalleled organisation; as the mastermind of the Great Escape, Roger Bushell inherited the codename of "Big X". More than 600 prisoners were involved in the construction of the tunnels. Three tunnels, "Tom", "Dick", and "Harry" were dug for the escape. The operation was so secretive that everyone was to refer to each tunnel by its name. Bushell took this so seriously that he threatened to court-martial anyone who even uttered the word "tunnel". "Tom" began in a darkened corner next to a stove chimney in hut