Existing comment:
Sleeper Spy
This is a replica of a bug the CIA planted inside the walls of the Soviet Embassy in DC as it was being built in the 1980s.
Dormant during construction, the bug was then remotely activated to drill a one mm hole from inside the wall and insert a microphone. An FBI listening post picked up the broadcast. The KGB eventually located the bug using its Non-Linear Junction Detector, tipped off by a US traitor. |