BLETCHLEY, ENGLAND - JUNE 03: Former "Wrens" and Colossus operators at Bletchley Park, (sitting, L-R) Margaret Mortimer, Joanna Chorley, Shirley Wheeldon and Lorna Cockayne listen to Commercial Director at The National Museum of Computing Jacqui Garrad explain some of the processes of the Colossus computer, used for codebreaking during World War II, at The National Museum of Computing on June 3, 2016 in Bletchley, England. During World War II British codebreakers helped decypher the German Army's Lorenz cypher using the Colossus computer and Tunny machine at the Government Code and Cypher School's (GC&CS) main codebreaking centre, Bletchley Park. The machines at Bletchley Park's Block H, the world's first purpose-built computer centre, helped gather crucial intelligence for the British military during the war. (Photo by Jack Taylor/Getty Images)
