There is no unstoppable tech, it's usually 100x cheaper to destroy than to build (a defining trait of our ever changing universe).

That said, I find FreakWAN [1] (from the creator of Redis) a very interesting low-cost, low-powered communication protocol that can go VERY far[2]

[1] https://github.com/antirez/freakwan

[2] https://twitter.com/antirez/status/1632664864538738688