Underground cavities in the U.S. are ticking time bombs that could suddenly turn into deadly sinkholes.
In March, a Florida man died after his bed was swallowed by a sinkhole that had opened up under his house.
That was a naturally-occurring disaster.
But in New Mexico, a man-made cavern is threatening to swallow up a big chunk of one town – and its residents.
Ed Lavandera has an Out Front investigation.