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And the US built a global network of microphones to track them called SOSUS. https://en.wikipedia.org/wiki/SOSUS https://en.wikipedia.org/wiki/SOSUS
by sseveran 6y ago
And the US built a global network of microphones to track them called SOSUS.
https://en.wikipedia.org/wiki/SOSUS https://en.wikipedia.org/wiki/SOSUS