While I'm only speculating, it could be quite possible that whoever may have wished to damage or destroy the AT&T building, seriously underestimated what these kind of buildings can take (essentially being disguised bunkers).

This certainly wasn't a small explosion, from the looks of it. But taking out a bunker .. unless you have access to weapons specially build for that purpose, good luck.

That AT&T still went down, may just demonstrated an apparent oversight in their emergency procedures for this site. I don't know the details, but having backup generators that rely any public infrastructure sounds like a pretty bad choice. That said, maybe those generators first burned through a decent supply of diesel fuel, only to later rely on (in this case absent) gas.

I have no idea how much diesel would be required to keep that site running for a prolonged period of time. Maybe such an amount could pose regulatory/safety issues on its own. Nonetheless, the sole purpose of emergency generators is to provide power that does not depend on any external factors (maybe aside from air/oxygen). So to me this story does sound at least a bit weird.

But somebody targeting that building and totally underestimating their chances, even if they may have still succeeded partially (if only by "luck") .. nah, that can not surprise me at all.

Facilities don't really keep that large of an inventory of fuel on site. Usually once they start running they have to call for fuel immediately and be regularly refueled until power is restored. They don't have a week of fuel or anything like that.

I don't see why natural gas is such a bad backup for utility electric. It doesn't share fate with the electric grid and it's buried. Seems pretty good.

How long will the gas grid keep working without electricity? Sure, the pressure is likely maintained from a reservoir, but many of the control systems likely depend on electricity, and I could imagine some being fail-safe (solenoids holding valves open and shutting if power fails).

For a very long time. The natural gas infrastructure uses natural gas generators to run the pumps that pressurize the lines and the meters are 100% mechanical. There's no reliance on the electrical grid. I lived through Northeast Blackout of 2003 (visible from space, the extent was so great) and Hurricane Sandy (power was out for a week) and in neither case was there an interruption to natural gas service. In my 40+ years, I don't ever recall the natural gas service ever going "out".

Gas runs forever without electricity. My folks have a gas generator on a pad at their home because ice storms take down the electric grid every year in their town. This year it ran for ten days straight.

Pressure in natural gas infrastructure is maintained by pumping stations that are fueled by the gas. These are huge and impressive and usually located far from any town.

It depends how well it is maintained, like most infrastructure.

https://www.wvpublic.org/news/2014-03-10/ntsb-determines-cau...

They deliberately do not use grid electricity, as they don't like sparking and there is no need for it. It's just simple mechanical pressure regulators, along with gas turbine compressors on long supply lines to boost the pressure.

Have they ever used those pressure-reducing stations to produce electricity?

Never sure if it went from theoretical to actual.

https://www.google.com/search?q=natural+gas+pressure+reducer...

A guy working in this building told me they had showers to clean off radioactive fallout as the building itself could stand up to a bomb. Guy said “you’d be fucked either way” and laughed.

https://en.wikipedia.org/wiki/33_Thomas_Street

It's probably not in this case but i wonder if this ATT was a special surveillance nexus...

I think it's most likely the bomb wasn't meant to target anything, but was just some person's outlet

Edit: i wasn't saying, "nuclear protection probably wasn't the case", i was saying, "the comment I'm about to make probably isn't the case but"... I know it's unclear

It’s a collection point of domestic VOIP for the FAIRVIEW program.

Nice find!

I stayed up late looking at network maps/etc trying to figure out any special features of the location, this was the only thing I could find. Likely coincidence, possibly not, but very high chance many people at 3-letter orgs have had a busy 24 hours as they also need to rule out some of the more exotic motives.

Where do you find such maps? I've looked before and it seems like a lot of the useful information isn't public

Lot of Snowden files still out there.

This is a relic of the cold war. Most of AT&T's telecom buildings were designed to be able to withstand just about everything except a direct nuclear strike.

While services were impacted, none of the actual infrastructure was really damaged and they likely just need to repair the lines running up to the building.

TLDR: AT&T's telecom infra is a relic of the cold war and is designed to withstand almost any type of attack.

Underrated comment.

https://en.wikipedia.org/wiki/Room_641A

>While I'm only speculating, it could be quite possible that whoever may have wished to damage or destroy the AT&T building, seriously underestimated what these kind of buildings can take (essentially being disguised bunkers).

Which somehow makes it more plausible to me? The type of insane person who would do this seems like the type of insane person who would underestimate how reinforced such a building is.

It’s odd that if you knew why the building was valuable you wouldn’t also know it’s designed for this. Which makes me lean more towards coincidence.

Maybe they were blowing it up to stop 5G rays from spontaneously generating viruses, in which case if they didn't really know what they were doing beyond a surface level it wouldn't come as a huge surprise.

It's not any rando that can get access to the levels of explosive necessary to do this in the domestic US, it's actually quite hard.

If you don't need it to be predictable or timely or anything than filling the interior of anything large with propane/natural gas can be enough to create a boom like this. It's essentially just replacing quality with quantity

Also on a vaguely related note getting annual statistics for meth lab explosions is surprisingly hard

Doesn't fit.

Either that, or they understood exactly what they were doing and simply needed to shut down 911 services for a while - perhaps so they could commit some sort of crime without the authorities being able to be summoned or coordinate.

Although someone choosing to bomb a place means I wouldn’t be surprised if they weren’t thinking everything through...

The announcement to move away shows a lot of planning.

yeah - as I commented elsewhere - mcveigh did a whole lot more damage with presumably less explosive (van vs. rv)

This really sounds like people playing with stuff they have no understanding of.

OKC bomb was in a Ryder box truck. Not a van.

Huh - you're right...Dunno why I thought it was a van.

Please provide evidence before spreading crazy conspiracy theories.

This looked way too bright/flamey/sooty to be a high explosive like McVeigh used.

Calling it a bunker might be overstating it. Maybe some are like bunkers or some have been reinforced. It’s hard to say.

Sometimes these central offices are put in really old buildings. Sometimes they are even put in regular homes in a neighborhood.

It’s simply based on where they need the connections/circuits and have access to electricity, etc.

No, a lot of AT&T buildings were built as bunkers, well blockhouses, during the Cold War. The typical "reinforced" criteria was being able to handle 2-3psi over pressure and storm force winds (70mph).

This particular building is an old AT&T-cum-BellSouth-cum-AT&T tandem office. It's where end offices (that connected to actual customer phones) would be connected together and connected to inter exchange carriers.

AFAIK AT&T tended to build their tandem offices as reinforced style buildings. They are larger than end offices and needed high availability because they were the central node for a region's telephone network and its connection to other networks.

I don't think I've ever seen any central office in a regular home in a neighborhood. Even end offices, while smaller than tandems, required a lot of equipment and power backups. Besides the equipment in the building they'd usually have secured parking/storage for service vehicles.

"Central Office" is the wrong term for it, but I've worked in a couple switching offices that were built to look just like another house in the tract. They were RSUs (Remote Switch Unit), that trunked everything back to a parent CO.

In both cases it was a housing tract that was allergic to ugly buildings or something. The vast majority of RSUs looked like smaller versions of the CO. Gray cinder blocks and asphalt.

That's interesting, I've only ever seen cross boxes (ugly green boxes) with RCUs in them. Then again I may have seen tons of disguised RSUs and never have known it.

To anyone interested, see "Anaheim 17"

http://www.thecentraloffice.com/calif/OC1/OCP.htm

While that's true, I think two factors strongly indicate that this was targeted at the ATT building. The first observation is, of course, that the ATT building was the closest to the explosion. A direct witness to the RV broadcasting the evacuation message, who lives across the street, describes this fact: https://www.youtube.com/watch?v=iag6cTWpgq8. The second observation is the evacuation message itself. How often do we hear about bombings where the bombers broadcast an evacuation message on a loudspeaker for 15 minutes prior to the explosion? Telling people to evacuate doesn't sound like the kind of thing you would do if your primary intent was to inflict loss of life.

> How often do we hear about bombings where the bombers broadcast an evacuation message on a loudspeaker for 15 minutes prior to the explosion?

This is how the Provisional Irish Republican Army operated, at least some of the time. For instance they telephoned in warnings 90 minutes before the 1996 Manchester bombing (1500 kg bomb, 212 injuries and no fatalities.) I've read somewhere they had established codewords with British authorities so those authorities knew which warnings to take seriously.

I think bombers broadcasting warning messages is somewhat more common with certain types of political violence. I know weather underground bombings tried to choose times for their bombings when buildings would not be inhabited, not always successfully.

If a group is hoping for a negotiated settlement they basically have to do it that way, both because mass casualty bombings tend to make negotiations impossible and because it increases confidence that a group could stop the bombings if their demands are met. Deadly bombings only seem to work when the group using them is trying to start a war.

Obviously the primary intent was not loss of life. But there are multiple possible intents, one being obviously to instill fear: "We didn't kill you this time, but we totally could have". Imagine living in the area now.

Anyway, it's better to wait for more information than to speculate.

Also, consider the timing. If you wanted to detonate a bomb downtown with the minimum possible casualties, early AM on December 25th seems about the best possible choice.

My theory is just a suicide, where the person did not want to hurt or kill anybody else, but wanted the notoriety. Additionally my theory is current or ex military who did it. Terrorist attack does not make any sense.

For what's it's worth, I live in Nashville.

It was also around 6am that the bomb went off and the ‘gun shot‘ alarm clock was 4ish

In the UK I've only ever encountered diesel fuelled generators with tanks usually long enough to run the DC for hours if not days. Easy to see in hindsight, but I guess I'm slightly surprised at the use of generators running off mains gas for this very reason. Does anyone know how common this is in the USA?

Liveleak actually has some security camera footage with audio of the recording: https://www.liveleak.com/view?t=aZhBY_1608918884

Anecdote: In my experience, a small but sizeable number of homes in suburban areas that are still outside the city enough to be affected by weather-related power outages every several months have whole-home generators connected to city natural gas lines. Growing up in one of these areas, there was the occasional power outage (once a year or so at most) but I can't recall any gas line outages. Those who had whole-home generators experienced no real outage, although in a colder climate having a gas heating system and a gas stove with a backup lighter/match are definitely more essential than keeping the lights on.

Gas lines don't typically go out due to outright outages for these types of situations, but I've experienced multiple outages in the past few years due to the grid not being able to accommodate the surge of demand during large power outages.

It's even worse/ more likely to happen for hurricanes, when natural gas wells and pipelines are shut-in in anticipation of the weather.

I'm more surprised that Nashville has city gas. It's not a very cold climate. It almost never even snows there.

For many years there was an unholy union between the timber lobby and the lineman’s union that required all power lines in Tennessee to be above ground. Middle Tennessee regularly has serious wind storms that knock out those power lines, so gas is attractive.

Also gas is just an efficient way to produce heat.

A lot of cities in Florida have natural gas including mine. My cook top, hot water, dryer and pool heater run off it. Not used for heating the house as a heat pump is plenty for the mild winter.

What city in Florida? I have only seen this in newer planned communities, never city or county wide in Florida.

Clearwater, FL

https://www.clearwatergas.com

You can see a maps of the gas lines in FL and counties that have it here:

http://www.psc.state.fl.us/files/PDF/publications/consumer/b...

Gas is useful for ranges or water heaters regardless of climate.

Sure, but as someone who's lived in the Southeast my entire life, I've never seen city gas. Where there's gas there's a tank that's filled by a truck.

Lack of gas service is mostly a geography issue ie rural vs urban, and less of a climate issue. Most of the small rural towns in the SE have gas service in at least the city centers, if nothing else for the municipal and the hospital generators.

On site Propane storage can be super expensive capital wise, and also it just does not give you much runtime for any serious usage. The best solution is battery with generator backup for onsite, which our local 911 just went to in the SE, because the uptime in that setup was 4x generator with onsite storage because of the increased production efficiency.

New Orleans has it.

I thought it was a warm-ish area, but, its 20F there right now!

https://darksky.net/forecast/36.1041,-86.7758/us12/en

I live at basically the same latitude. That's thing... this is about as cold as it ever gets, and it was 70F here two days ago - 30 currently.

Very common. Short of something like this, it's unlikely your natural gas and electric service will both go out at the same time. Natural gas turbines fed by the city service are a common backup source. Some sites will also have provision for running off bottled gas, some won't.

Very common for residential buildings - the house I grew up in in Ohio had an automatic standby back up generator than ran off of piped in natural gas. The idea was to protect against weather-related power outages. (Generally snow or wind causing trees to fall on power lines)

I’m not sure how common this is in commercial buildings. Mains gas powered generator doesn’t seem like a very good idea for anything critical.

There have been companies offering gas-mains alternatives to generators; it's pretty rare that both your electricity grid and gas grid go off together - and if someone is bombing your building you've got other problems.

Ex-telco here. Wherever underground diesel tanks are practical, they use that instead. Nat-gas is for dense urban installations only, as I understand it.

There is 0 doubt that they were targeting the hub, they parked right beside that building, not on the side of the street with restaurants. There is a gaping hole in the side of the building, though how much damage was done isn't known. Some services were affected before they had to cut the generators, per some reports. Internet and cellular is still down, and our DirecTV local channels went black right when they cut the power. I suspect they redirected that because it came back an hour later well before cellular and internet.

They also had an announcement warning people to evacuate, so they clearly weren't optimizing for casualties. I don't think "which side of the street" tells us anything.

How does it not? You are going to park closest to what you want to suffer the most damage. They parked right next to the AT&T building. They wanted to damage that building, if they had parked on the side with all the restaurants it probably would have destroyed that entire side of the street, those buildings are very old, some are pre-civil war facades. The AT&T building had to have a close high impact bomb to even make a dent, it's so obvious that was the target.

Lessons of Die Hard from Nakatomi Plaza - if the services go down because of emergency procedures following a playbook (ie shut off gas & power as a standard response), that's as good as taking out the gas & power directly, and is just as targeted.

The services went down about 6 hours after the attack. I suspect the gas was cut very soon after the blast and their internal generators lasted 6 hours.

Could just be good planning if they knew that was procedure after an explosion.

It could be interesting for regulators to see if anyone "miraculously" managed to make a lot of money from/during this incident, because some people do have the resources to pull something like this off and make a profit from it. But I think it's rather unlikely.

Aside from that, I seriously doubt that just disruption of AT&T services was the objective here. Considering that this appears to have been a rather serious explosion, I guess the intent was more likely destruction rather than disruption.

With the amount of 5G nut jobs running around these days, I suspect that it is far more likely that somebody just seriously underestimated what it takes to bring down a building like this one.

But I guess that time will tell (more). I'm just speculating of course.

It honestly reminds me of something from an Ocean's movie, where they destroy some piece of infrastructure just to get past a security camera or something

But the 5G conspiracist angle actually makes a ton of sense.

There’s always the option of disgruntled/fired employee out to destroy the company.

AT&T has been pushing really hard on folks in the last year to take early retirement packages that would give you a fraction of what you would have gotten if you stayed on until being eligible. Friend of mine recently took the package and found a job elsewhere and commented that morale is pretty down if you are in that camp.

Anyone working on AT&Ts infrastructure (to have familiarity with what that building even is) knows that small attack won't bring them down.

I agree unlikely but that same thing crossed my mind, an oceans 11, Italian job plot, knock out AT&T and the bank alarms go out ? I doubt it but come Monday Morning if a bunch of bank vaults in the area are cleaned out, it would be a pretty amazing heist plot for sure. But they would have to have some inside info because most C.O.'s have diesel generators so if the AT&T C.O. there depended on Natural gas, someone would have to know that. Also, most of them have 4 - 8 hours of battery so the AT&T services went about that long after. I am sure the cops are standing guard in front of the banks right now I would guess.

Markets and banks and such were all closed because of the holiday.