More things I'm wondering about (in addition to why such a single point of failure and why didn't emergency lights come on)....

- How secure is that single point of failure switch room? How difficult for a terrorist or other bad actor to access it?
- Can a switch room like that have a Halon system?
- Why doesn't Delta and ATL have a better emergency plan in place to deal with the tens of thousands of people there?
- Will Delta and ATL (and other airports) correct the deficiencies from this? When
- Will Delta and ATL (and other airports) look for other similar deficiencies and begin corrective action?