A Century in the Shadows: How Britain Built its Top Secret MI6 HQ

Inside the building there is rumored to be a shooting range, ultra secure areas where eavesdropping is impossible, and a faraday cage which blocks incoming radio waves.

In a Financial Times interview, a spy said how employees are instructed to turn off all mobile phones long before they get in the building and there is lot more to it.

Explore every details with us in this video.

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