It was apparently 2 Spies from the West, leaking details from the Nagasaki bomb to to the Soviets.

They are know. I will check their names again 🙏🏽

Theodore Hall was one of them:

https://www.britannica.com/biography/Theodore-Alvin-Hall

haha no 😅

There were actually 2 engineers from „the West“ who leaked documents from the Nagasaki bomb to the Soviets.

That’s how they could manage actually.

Still reading up the story, but it was those two „Spies“ who helped them tremendously