This is a much more interesting video than the Veritasium one IMO. I mean, if you don't already know anything about Enigma then, sure, the Veritasium one is decent. But it's been done so many times and who doesn't know it at this point? Somehow, though, I hadn't understood the scale of the operation at the Park and how it was kept secret that whole time. The bits about compartmentalisation of knowledge were particularly interesting.