The 8,000 people who worked at Bletchley Park during the war were forbidden from ever discussing their work. This vow of secrecy lasted, for many of them, their entire lives. Some never told their own children. Margaret (Meg) Rock, a codebreaker in Hut 6, worked on breaking the German Army Enigma for the entire war. After the war, she took a job as a schoolteacher and never spoke of Bletchley Park. When asked in a 1992 interview why she never told anyone, she said: "We were told not to, and that was that." Her husband of 40 years didn't know until a BBC documentary aired in 1993. She died in 2001. The codebreaking work wasn't officially acknowledged by the British government until 1999. The last surviving Bletchley Park codebreaker of any rank died in 2023 at age 101.