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hydrophones submerged around the world to detect vessels
They've been doing that since the 50s https://en.wikipedia.org/wiki/SOSUS. But they don't talk about it much. If one side is routinely able to detect the other's submarines they wouldn't want anyone to know. It would make the submarines pretty much useless and something much better would have to be developed.
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I knew they bugged undersea cables and marine passes, but the thought of a sole listening device in an undersea trench out in the middle of the Atlantic never really occurred to me.
If those chaps are floating on the surface, they’re bound to get seasick as hell with the wave movement and no static visual reference points.
Thanks for sharing, quite informative on several subjects: TIL the worlds militaries have hydrophones submerged around the world to detect vessels.