The Nashville Emergency Communications Center had multiple back-up plans in place in the case of an event like the bombing, and they worked. Here are the gaps they're still working to fill.

No one could have predicted what took place on 2nd Avenue on December 25 or the chaos that ensued afterward when much of the region was left without service. But, it's the ECC's job to prepare for the worst.

"Events like this happen as often as every year, or every other year, on a much smaller scale," Nashville ECC Director Stephen Martini explained. Martini said he was referring to weather events or construction projects. Still, a bomb going off right in front of the building that connects much of the southeast was a first. "This is the largest scale 911 outage since the 2004 rolling blackouts," he said.

Read more: WSMV (Nashville)