CIA公式アカウントが語る1950年代半ばの東ベルリンにおける盗聴作戦 #BerlinTunnel (Operation GOLD)

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#OTD 1955: Successful completion of the #BerlinTunnel (Operation GOLD), allows tapping into Soviet cable lines in East Berlin. #HISTINT

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In the 1950s, before recon satellites, wiretaps were an important means of collecting intel re Soviet military capabilities. #BerlinTunnel

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Almost all Soviet military telephone & telegraph traffic between Moscow, Warsaw, & Bucharest went through Berlin. #BerlinTunnel

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Dulles approved covert tunneling & tapping op in JAN 1954. @usairforce warehouse in W. Berlin was a cover for construction of #BerlinTunnel

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Tunnelers removed 3,100 tons of soil & used 125 tons of steel plate & 1,000 cubic yards of grout. #BerlinTunnel pic.twitter.com/Znkxs6WVVE

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Finished #BerlinTunnel was 1,476 feet long. British technicians installed the taps & collection began on 11 May 1955. pic.twitter.com/gXEyfbpb2j

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UK intelligence officer George Blake, a Soviet spy, made the Soviets aware of the #BerlinTunnel from its beginning. pic.twitter.com/4Dl3HpZ34w

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To protect Blake, KGB allowed #BerlinTunnel op to continue until April 1956 when they “accidentally discovered” it. pic.twitter.com/Q3UuTjm7fU

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Soviets hoped to win a propaganda victory by publicizing the #BerlinTunnel. But most press marveled at the audacity & technical ingenuity.

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Tomorrow we will tell you what intel was collected from the #BerlinTunnel operation or you can read about it here: 1.usa.gov/1JwLRzt

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Berlin Tunnel: America's Ear behind the Iron Curtain bit.ly/1zS4DBu

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Tools were handmade of ivory & stored in a travel roll. They were used for surreptitious opening of letters & packages during the 1960s.

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May 1955: Successful completion of the #BerlinTunnel (Operation GOLD), allows tapping into Soviet cable lines in East Berlin. #HISTINT

CIA @CIA

#BerlinTunnel yielded: 443,000 transcribed discussions 40,000 hrs of phone conversation 6,000,000 hrs of teletype traffic 1750 intel reports

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Studies show Soviets had not attempted to feed false info over #BerlinTunnel tapped lines—intel collected was genuine pic.twitter.com/MD5naOdUWf

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#BerlinTunnel, our most ambitious operation at the time, was a success & yielded valuable intel for US policymakers & war fighters such as:

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Order of battle & info on activities of Soviet & Warsaw Pact forces & Soviet inaction re a military invasion of Western Europe #BerlinTunnel

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Identification of workers on Soviet atomic energy projects & early warning of Soviet’s establishment of an E. German army. #BerlinTunnel

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The poor condition of East German railways, resentment between Soviets & East Germans, & great tension in Poland #BerlinTunnel

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If you missed any part of our story or to read more about the #BerlinTunnel operation: 1.usa.gov/1JwLRzt pic.twitter.com/qEG5ZFt5jl

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CIA @CIA

ICYMI: 1955: completion of the #BerlinTunnel allows tapping Soviet cable lines in E. Berlin. 1.usa.gov/1JwLRzt pic.twitter.com/8CT74ZrQty

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