[Rocky]

It’s amazing that they were able to keep Bletchley Park a secret during the war, and even more so that they were able to continue to keep much of their work secret for many years after the war.

There is a book called Code Breakers which came out in 1993. The various chapters in the book each deal with some narrow aspect of the work at Bletchley, and each chapter is written by a person who was involved in that particular work. It’s a little rough reading because not all of the contributors are great writers, but it has the advantage of being accounts by the actual participants.

There are two chapters in the book concerning the work on Tunny.

[Mycroft Holmes]

It’s amazing that they were able to keep Bletchley Park a secret during the war, and even more so that they were able to continue to keep much of their work secret for many years after the war.

I blame the internet. Before 1995 or so the average joe didn't have a cost free publisher for his juicy stories. News was generated by gatekeepers who toed the regime's line reliably. Now, you have blog pimps flogging all manner of text to anyone who reads. Messy, but overall it's an improvement.

Fight the Free Sh☭t Nation

[SunkenCiv]

The Soviet moles inside British intelligence knew about Ultra, and so did Stalin and his upper echelon.