For a few hours this week, the entire US air traffic control system nearly collapsed because someone with a shovel severed a fiber optic cable. Not a cyberattack. Not a solar flare. Not even a particularly clever heist. Just construction workers doing their job, which apparently overlaps with the job of keeping the economy airborne.

This is the kind of incident that should embarrass us all. Not because workers made a mistake—they didn’t know the cable was there—but because we have built an economy so fragile that its nervous system runs through literal trenches where people dig for a living. The real scandal is not that the cable got cut. It is that we only have one cable.

Airports, the circulatory system of modern commerce, went dark because of infrastructure that was probably installed during the Clinton administration and has been held together by hope and deferred maintenance ever since. The cable got repaired. Flights resumed. Everyone moved on. But here is what actually happened: we got a live demonstration of what economists call “systemic fragility,” which is a fancy way of saying “we are one construction worker away from chaos.”

The real Air Traffic Control is not the system that guides planes. It is the funding mechanism that keeps critical infrastructure from being a single point of failure. And that system is clearly broken. Not metaphorically. Literally. By a shovel.

So the next time someone tells you the economy is strong, remember: it nearly stopped because someone dug in the wrong place. That is not strength. That is the economic equivalent of holding your breath and hoping no one sneezes.