How do you keep 8,995 codebreakers secret?

At Bletchley Park, I ask: how did the Intelligence Factory stay secret? | AD: 💼 Find a fulfilling career that also helps the world: https://80000hours.org/tom | England series map: https://www.tomscott.com/england/ 🟥 MORE FROM TOM: https://www.tomscott.com/ (you can find contact details and social links there too) ❓ LATERAL, free weekly podcast: https://lateralcast.com/    / lateralcast   👥 THE TECHNICAL DIFFICULTIES:    / techdif   Written and presented by Tom Scott Producers for Penny4 https://penny4.co.uk/ Cambria Bailey-Jones Guy Larsen Studio Associate Producer Heloise Lowenthal Studio Director of Photography Jamie MacLeod Studio Gaffer Frank Hammond Head of Post for Breadbox Studios https://www.breadboxstudios.co.uk/ Mandy Celine Associate Post Producer Isla McTear Senior Editor Bethan Leadley Online Editor Jamie MacLeod Sound Supervisor Dan Pugsley Sound Assistant Maggy Apodaca Subtitles by So Speedy https://www.sospeedy.co.uk/ With thanks to the Historic County Borders Project https://www.county-borders.co.uk/ Executive Producer Tom Scott © Pad 26 Limited MMXXVI