"Room 40"
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Room 40 was responsible for a series of important naval decrypts at the Battle of Jutland in May/June 1916 (which were largely misused by the Admiralty) and, rather more spectacularly, in deciphering the Zimmermann Telegram in 1917.
This was a room within the building of British Naval intelligence. By splicing into the transatlantic cable, a cable that laid on the sea floor going from one continent to the next, these cryptographers were able to pick up coded messages for decyphering.
This was a room within the building of British Naval intelligence. By splicing into the transatlantic cable, a cable that laid on the sea floor going from one continent to the next, these cryptographers were able to pick up coded messages for decyphering.
How Did Room 40 Get the Information?
British Naval Intelligence spliced into the Atlantic cable that ran along the ocean floor. Through this action they were able to access any and all coded messages leaving and coming into Germany. The problem they faced was the issue of decyphering the messages.