See also the HeyPhone and Nicola systems built by underground boffins in the UK ... | Hacker News

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		twic on Nov 10, 2021 \| parent \| context \| favorite \| on: Cave-Link: Underground text communication system See also the HeyPhone and Nicola systems built by underground boffins in the UK and France: https://www.shropshirecmc.org.uk/radio.html http://www.scavalon.be/avalonuk/technical/radio1.htm https://www.electronicsweekly.com/blogs/engineer-in-wonderla... https://www.caverescue.org.uk/nicolaradio/ http://site2.caves.org.uk/radio/comms_in_caves.html

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