Some ISPs managed to get FEMA to let a tanker through and that's how
we're back up. It wasn't pretty though.
I remember that after 9/11 the real network hits started about 3 days
later, when the diesel generators started running out of fuel in the
downtown telco hotels, and there was no way to physically get fuel
trucks to their location. The equipment and generators were fine, they
just ran out of fuel.
If you look at the flooding in downtown New Orleans, it looks like this
might happen again there.