Room 40

Room 40 was a British naval intelligence unit during World War I, established in 1914. It was responsible for the cryptanalysis of intercepted enemy communications, particularly those from the German military and naval forces. The name "Room 40" comes from the physical location of the unit within the Admiralty building in London. The unit played a significant role in the war by decrypting important messages, which provided the British with insights into German naval strategies and operations.