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A comment on Veteran submariner on how sonar crews tirelessly hunt enemies they can't see. Parent comment

Re:Veteran submariner on how sonar crews tirelessly hunt ene... by pgreenwood on Thursday August 13, 2020 @12:55AM (#24140062)
And Poland cracked Enigma in 1933, and then shared their techniques and Enigma clones with the British in 1939!
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