| Summary/Abstract |
The story of recovery German codebooks from the wreckage of German light cruiser Magdeburg by Russian Navy and the latter use of these books by Royal Navy are widely known. What the Russians were doing with their copies of codebooks has not been thoroughly covered in English. This article deals with elaborate SIGINT system on the Baltic Sea during WWI and especially the heart of it – Sipthamn SIGINT station. There in the middle of woods in current Estonian territory was situated the first radio station in world with intelligence as its primary function. Decryption efforts were directed by Ernst Vetterlein who left Russia 1918 to become a leading cryptologist on Russian direction in the British GC&CS.
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