This would be up there. I do remember a few telco ones that were similar or bigger in terms of impact.
There will be many folks burning the midnight oil to bring the infrastructure back online. I have every confidence that they'll be putting in mitigations avoid this from reoccurring.
I say this from past experiences working in a different in the trenches in a different industry.
Should have been mitigation's in place to stop it happening, but then its difficult to comment as we will never actually know what the issue was/is. It does seem very third world.