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There's at least one commercial acoustic underwater modem provider - Subnero out of Singapore. They claim up to 5km range: https://subnero.com/products/modem.h

by snaily 3y ago

There's at least one commercial acoustic underwater modem provider - Subnero out of Singapore. They claim up to 5km range: https://subnero.com/products/modem.html https://subnero.com/products/modem.html

closewith 3y ago
> 4 km of communication range (horizontal) in littoral waters Probably much lower range vertically.