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Operation Gold
Operation Gold (also known as Operation Stopwatch by the British) was a joint operation conducted by the American Central Intelligence Agency (CIA) and the British Secret Intelligence Service (SIS) in the 1950s to tap into landline communication of the Soviet Army headquarters in Berlin using a tunnel into the Soviet-occupied zone. This was a much more complex variation of the earlier Operation Silver project in Vienna. Soviet authorities were informed about Operation Gold from the very beginning by their mole George Blake and "discovered" the tunnel in 1956.
Details of the project are still classified - especially by the British - and whatever authoritative information can be found is scant. This is primarily because the then-Director of Central Intelligence (DCI), Allen Dulles ordered "as little as possible" be "reduced to writing" when the project was authorized.
==Background==
After the Red Army followed the Soviet diplomatic department, and transferred its most secure communications from radio to telephone landline, the post-World War II Western Allies lost a major Cold War source of information. Operation Gold was hence at least the third tunnel built to aid intelligence in the Cold War period post the end of World War II. From 1948 onwards under Operation Silver, British SIS had undertaken a number of such operations in then still occupied Vienna, the information from which enabled the restoration of Austrian sovereignty in 1955. The KGB later commissioned the Red Army to construct a tunnel to tap into a cable that served the major US Army garrison for Berlin.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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