One of these, a Canadian called , was actually originally in charge of digging and camouflage before his transfer.
The prisoners were separated into two groups.
On the evening of 19 October 1943, Codner, Williams and Philpot made their escape.
Under the seats in the theatre there was a large empty space but when it was built the prisoners had given their word not to misuse the materials; the system was regarded as inviolate.