03/18/2010 05:12 am ET | Updated May 25, 2011

Cavern Threatens To Swallow Carlsbad, New Mexico

The bright yellow signs on U.S. 285 are the first indication that things aren't right in Carlsbad.
"US 285 south subject to sinkhole 1,000 feet ahead," motorists are warned.

But there is little other evidence that in southeastern New Mexico's oil country, a giant cavern sits beneath the earth, ready to swallow part of the highway and possibly a church, several businesses and a trailer park.