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Existing comment: The End of Operation Ivy Bells:
When a satellite photo revealed Soviet warships gathered at the site of the underwater listening device, the US knew Operation Ivy Bells was in trouble. Sure enough, when Navy divers returned to the scene, the bug was gone.
An investigation revealed that a National Security Agency employee, Ronald W. Pelton, had sold critical information to the KGB for $35,000. Pelton was convicted of treason and sentenced to life in prison.

USS Halibut carried the deep-sea divers who installed the waterproof listening pod on the Soviet underwater cable.
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