Comment by lambdaone
The real "resilience teams" are going to be at the telcos/ISPs, and they will have dark fibre between their networks and autonomous backup power in their data centres. They will be able to do IRC, VoIP telephony, email, etc. between their networks over statically routed point-to-point IP between their local networks even if BGP and the transit networks go down so they can "black start" the Internet. (Back in my ISP days, I remember reading about there being a private telephone network just for AS operators' NOCs to talk to one another quite independenty of the PSTN.)
For anything that takes even those out (eg. a "Big One" quake in California), you fall back to radio hams and autonomous radio links for the disaster services.
The article's author mentioned speaking with some telco people, which apparently weren't aware of any resiliency emergency plan. Maybe there's some difference between EU countries and the USA on this.