How Sweden cracked a secret German code in 1940

I am about to start a very long game of “Gary Grigsby's War in the East” where I play only one turn per week. So, if I don't loose directly, or win the first year (unlikely), this might take 5 years (or 250 weeks). I will continue playing no matter how bad/good it goes. So in this spirit, here is a short video about how Sweden cracked a secret German code, and knew in advance about Operation Barbarossa.
---Sources---
SVT documentary “G som I hemligt”
https://en.wikipedia.org/wiki/Arne_Beurling
https://en.wikipedia.org/wiki/Siemens_and_Halske_T52

Видео How Sweden cracked a secret German code in 1940 канала JMS WW2