The SOSUS mission is declassified

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The mission of the US Navy Sound Surveillance System, a network of seafloor hydrophone arrays built from the mid-1950s across the Atlantic and Pacific, is declassified. Its use of the deep sound channel, designed to hear submarines at long range, turns out to suit low-frequency baleen whale calls exactly. A military listening system becomes, without being redesigned, the first basin-scale whale observatory.

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