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Description of  Spies Beneath Berlin

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. Trust, even between allies, was dangerous. Despite the Burgess and Maclean affair, the Americans had decided that co-operation was safe once more, and Stopwatch/Gold was a joint CIA/MI6 project using British expertise from a prototype in Vienna. This was a mistake: there was another mole in the British secret services, and the KGB knew about the tunnel even before it was built. Why the KGB kept the secret to itself is one of the puzzles explored in this book. Was it inter-service rivalry? Was the British mole so valuable that the KGB sacrificed Red Army secrets rather than blow his cover? Or, since the Russians in fact had no plans to attack the West, did the KGB want that information leaked to reduce the risk of surprise strikes the other way?