this movie be huge falsification of history . first of all polish mathematician and cryptologist decrypt enigma several year before wwii . decrypt machine be already build . you may read about it here http represent or or en . wikipedia . org or wiki or cryptanalysis_of_the_enigma but polish contribution to the story in this movie be mention in this movie in one single phrase . but there be even bad point . the only bad character of the movie be a pole . author of this stupid scenario invent polish guy who would be able to betray ally and become a german spy . what an absurd . this author probably know nothing about polish attitude to nazis during wwii . poland during wwii have two occupant and two enemy nazi germany and soviet union . but no one would join one enemy against the other . it be impossible . but not for maker of this movie . if pukowski be a real man and after reveal the truth about katyn and he would probably commit suicide .