Like what qw23 in their split post said, it wasn't just Mr Turing who worked on the computing processes to decipher the Nazi Enigma Codes - there were multiple people working at Bletchley Park and many people who worked indirectly FOR Bletchley Park as spies, who would steal messages received by a wireless reading Morse Code Messages and send them back to Bletchley Park in time for decoding (they would go on to work for other government agencies like the CIA but let's not get to ahead of ourselves)