Underwater walkie-talkies could work long-distance with radio trick
Divers often struggle to communicate because radio waves can’t travel far through water, but a way to send the waves up and across the surface before dropping back down again could change that
![Underwater walkie-talkies could work long-distance with radio trick](https://images.newscientist.com/wp-content/uploads/2023/11/10140654/SEI_179026276.jpg)
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