Wireless communication breaks through water-air barrier, MIT News

MIT Media Lab researchers developed a water-air communication system, Translational Acoustic-RF Communication (TARF), where an underwater transmitter directs a sonar signal to the water’s surface, causing tiny vibrations that correspond to transmitted data, which an airborne highly sensitive radar decodes.

Researchers Realize Water-air Acoustic Communication Based on Broadband Impedance Matching----Chinese Academy of Sciences

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Underwater and Airborne Craft Can Now Communicate Directly and Wirelessly

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Wireless communication breaks through water-air barrier, MIT News

Low-power underwater communication

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Overview ‹ Wireless communication from underwater to the air — MIT Media Lab