Cock Builder
Some years ago I happened to be at Old Sarum collecting an aircraft and got chatting to a very tall guy who was building a seaplane in the hangar.
It turns out that he was in Colditz as a result of his Sunderland crashing during the Crete/Greek campaign.
He was involved with the glider and said its main benefit was to give them something to get stuck in to avoid the boredom of being locked up.
His account of the Sunderland accident (at night) on an evacuation flight was most interesting, acting as he was as co-pilot at the time trying to let down in complete darkness without altimeter reference, and striking the water with some force as they were much lower than they thought.