There might be internet, likely one that you can't use much before being arrested. That's why I build software where internet isn't mandatory. We should still be able to use our cellphones even if they cut our access.

Yes, I think that meshtastic is a great project for that. I will learn more

It isn't. That was an awful project which ignored basic requests and code contributions for several years that would have made it usable. The moment that meshcore was released last year, almost everyone jumped away from that awful project. For your information, LoRa only permits a few text messages per hour. It is not capable for sharing pictures, files nor voice. Plus, when more people use LoRa on the same region than the frequency quickly gets crowded and you are not even able to send those few text messages. This has happened again last month in Portugal during the floods. Everybody with LoRa wanted to send messages and the more crowded it was, the more people insisted on sending messages. So, it failed even on the scenario it was meant to be useful. It is a good toy, but really far below bluetooth, WiFi and radio walkie talkies.