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Ham radio, dude
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That's just a carrier.
You could even use IP over Avian Carriers (IPoAC)
https://upload.wikimedia.org/wikipedia/commons/1/10/Taube_vor_Sche%C3%9Flitz_%28cropped%29.JPG
But if the Internet goes down as a whole, it doesn't matter which carrier you use, because there would be nowhere to connect to.
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We could keep going...nuclear Armageddon, collapsing universe.
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It can be taken down if the Internet goes down.
It's unlikely, but it can happen.