A friend of mine tried to convince me a while ago that there are huge underground cities in America where all the politicians and captains of industry will remain safe and well when massive solar flares destroy all technology. He told me that when the solar flares disrupt all electrical systems there will not longer be any electricity and civilisation will come to an end.
I gave him two flaws in his theory:
First, if civilisation did fall and we returned to some sort of bronze or iron age, then what good would it do all the politicians (who have no practical skills whatsoever) saving themselves, as they would hardly be able to take up where they had left off, if the society where they had previously held power no longer existed.
Second: Civilisation, industry, Government etc all evolved and became effective long before electricity. After all, the Victorians probably considered themselves civilised.
Some folks get some funny ideas.
BTW: The solar flare thing is real, which is why aircraft have shielded electrical systems and multiple system redundancy built in.