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A comment on James Cameron begins deepest dive. Parent comment
very hard to find info on how it works or at what ranges. but this suggests that it shifts sounds down to lower pitches to travel further. https://en.wikipedia.org/wiki/Modulated_ultrasound
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very hard to find info on how it works or at what ranges. but this suggests that it shifts sounds down to lower pitches to travel further. https://en.wikipedia.org/wiki/Modulated_ultrasound