![]() But you have to learn those, and see them when they’re used for them to work you can bet at least some divers wish they could tap out a message like they do above the waves. Professional divers will have a vocabulary of dozens of signals, from “low on air” to “danger to your right” and anything else you can imagine coming up during a dive. So for as long as anyone can remember, divers have communicated to one another using hand signals and other gestures. Not humans, though - because the way we make sound only works well in air. Sound waves, on the other hand, travel through water quite readily, and are used by countless aquatic species to communicate. That’s one reason submersibles and the like need a tether: to pass data back and forth to the surface. ![]() The communication problem underwater is simple: Rradio waves are absorbed by water, and no signal our phones send or receive can travel more than a few inches without being completely lost. It may sound silly, but millions of people could use this tech in both recreational and professional diving situations. Don’t you hate it when, after going just five or 10 meters underwater, you lose signal completely? Now this vexing limitation of modern technology is being addressed by researchers at the University of Washington, who have made an underwater communication app that uses sonic signals to pass messages to your other submerged friends.
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