Did you know that Ripple has achieved it?

Did you know that Ripple Labs is conducting tests to make payments through XRP without using the internet and over long distances?

Yes, of course. Using shortwave radio signals, with a walkie-talkie, at its frequency, and with another receiver with another walkie-talkie, it has managed to transmit a payment through the radio signal of these devices, without using the internet, being able to link the wallet with the frequency of the walkie-talkie and over long distances or in places without internet access, enabling payments to be transmitted from one wallet to another. So far, the tests have been successful, and soon the news will be announced, along with how it can be done from the enabled wallets, pioneering and unique technology that will be patented by Ripple Labs.

Making crypto payments without using the internet.