On graduating, she was sent to Scarborough where, as the war continued, more and more Wrens would congregate in a secret underground hall on Irton Moor, today inhabited by Government Communications Head-quarters (GCHQ), intercepting and decoding U-boat radio signals.* For all the wolfpack’s power and menace, it had one key weakness. In order to organise their U-boats for an attack, the captains needed to communicate at regular intervals, initially to report the sighting of a convoy, and then to invite other boats to join. Even in the midst of battle, requests often came in for U-boats to
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