Finally, an underwater messaging app

Don’t you hate it when, after going just 5 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. It may sound silly, but millions of people could use this tech in both recreational and professional diving situations.
The communication problem underwater is simple: radio waves are absorbed by water, and no signal our phones send or receive can travel more tha

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