The deep sound channel was a test conducted of the west coast of Australia where a series of charges were let off in a certain sequence they rounded the Cape horn and were detected 6 hours later in the Bermuda listening station by SOSUS.
SOSUS led to the finding of USS Scorpion it also led the USN and CIA to K129 in the pacific with Project Jennifer and Azorian, SOSUS also tracked the 4 foxtrot submarines heading to Cuba in 1962 plus the two other November class submarines sent from the Med, and this is all from sea floor microphones.
However in Operation Atrina in the 80's the Americans did have serious issues finding the 5 victor III sent out from the Northern Flota 4 were found after 8 days while they were on thier way home after completing thier tasks.
The 5th under the command of captain 1st rank Victor Alikov (dubbed by the west as the prince of darkness) was never discovered
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