The submarine that tapped the Soviets' phone
Briefly

"Operation Ivy Bells was an ambitious undertaking aimed at tapping into a critical communication line, showcasing the lengths to which the U.S. military would go during the Cold War to gather intelligence."
"Captain James Bradley’s idea stemmed from the necessity of secure communications between the Soviet submarine fleet headquarters and command centers, highlighting innovative military strategies of the era."
Read at english.elpais.com
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