The BBC's Security Correspondent Gordon Corera gains exclusive access to Britain's ultra secret listening station where super computers monitor the world's communications traffic.
Derrick Duplessy, Mignon Fogarty, Gretchen Rubin
BBC World Service
Tsh Oxenreider
Startofactory
Shaino
Yogesh Bhatt
Sajith Kumar
Robert Hirsch
cosmolytic
Shivam singh rana
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