Internet Apocalypse.

[Joe]

Guys have you ever been in a Switch Centre ? I’ve been in several and I can give you an idea how things go together.
Two UPS supplies A and B
Generator back up.
The fibre is normally set in a ring so you can lose the West or East and still stay on.
Additionally you can lose the West or East optical transceiver and still stay on.

You can see the system has redundancy built in and a failure on one path won’t take you off. Add to that an Engineer will be on site in no time to repair the failed side.
I know the fibre systems I maintained in the past could take a hit, additional some of the systems I maintain nowadays ( not fibre) are designed to be tolerant to far worse than a solar flare.
People make the mistake that infrastructure just runs, it doesn’t. In the real world of storms, lightning strikes, floods etc systems will be affected and in 99.9% of the time people won’t notice that redundancy is lost. But in the background some engineers phone will be ringing and he will be on the road to restore things.