By The Atlantic

In the early 1970's, the U.S. government learned that an undersea cable ran parallel to the Kuril Islands off the eastern coast of Russia, providing a vital communications link between two major Soviet naval bases. The problem? The Soviet Navy had completely blocked foreign ships from entering the region.

Not to be deterred, the National Security Agency launched Operation Ivy Bells, deploying fast-attack submarines and combat divers to drop waterproof recording pods on the lines. Every few weeks, the divers would return to gather the tapes and deliver them to the NSA, which would then binge-listen to their juicy disclosures.

The project ended in 1981, when NSA employee Ronald Pelton sold information about the program to the KGB for $35,000. He's still serving his life prison term.

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