From what it sounds Bitcoin as a network is very robust compared to even a centralized system. Bitcoin works similarly to how Napster, Bittorrent, or even Starlink is setup. Even if the entire world lost power, Bitcoin would begin to recover as soon as systems came back online. I used Morse code as an example but any internet connection (LTE, fiber, power over internet protocol, wi-fi, satellite, ect...) will do.