Spies Beneath Berlin. Шпионы под Берлином (David Stafford) ; John Murray

Operation Stopwatch/Gold, said CIA chief Alan Dulles, was one of the most valuable and daring projects ever undertaken. In 1955 it ran a tunnel 800 metres under the Russian sector of Cold War Berlin, and for more than a year tuned into Red Army intelligence. This was an almost impossible trick: apart from the technical wizardry needed, any noise or vibration could have given the game away. When snow fell panic measures were suddenly needed to prevent it thawing in a tell-tale line leading to the target building.

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