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A better way to transmit messages underwater

A better way to transmit messages underwater
Radio waves cannot penetrate water, so cannot be used for submarine communication. That is why the sea is probed by sonar, not radar. But, as people and their machines venture ever farther into the deep, ways of building underwater communications networks would be welcome. And researchers at Newcastle University, in England, led by Jeff Neasham, think they have just the thing to build them with: an acoustic “nanomodem”.

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