Ivy Bells proved one of the greatest coups by U.S. intelligence during the Cold War.
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Halibut and other submarines began regular courier runs to install new tapes on the tap while bringing back the old tapes for analysis by the NSA in what was called Operation Ivy Bells.
Since 2015, there have been reports of Russian submarines and spy ships trawling the waters near the ocean-spanning underwater fiber-optic cables vital to trans-oceanic Internet access. In fact, reported activity by spy ship Yartar off the U.S. nuclear-armed submarine base in King’s Bay, Georgia is likely in search of secret military cables used exclusively by the Pentagon.