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US Navy Divers tapping a Soviet military cable in Siberia. Known as "Operation Ivy Bells." Four hundred feet deep saturation dives and breathing Heliox. Considered the most dangerous of the Cold War and the Mount Everest of spy missions.
By GM MathenyUS Navy Divers tapping a Soviet military cable in Siberia. Known as "Operation Ivy Bells." Four hundred feet deep saturation dives and breathing Heliox. Considered the most dangerous of the Cold War and the Mount Everest of spy missions.