A Loudon County resident speculated on Thursday that the noise could have come from maintenance on an underground pipeline…
“It’s scary-loud. It’s loud enough that it makes your heart stop for a second,” said Andy Wombold. “It sounds like a shotgun or an explosion of some kind.”
Wombold and dozens of other residents in the neighborhood are unable to say exactly what “it” is. All they know is the mysterious booms have provided several rude awakenings that sent residents scrambling in fear.
Source: Phantoms and Monsters (naturalplane.blogspot.com)
Sonic booms, blasting at the nearby quarry, local military exercises and construction activities have been ruled out. Mysterious ground and sky noises are not that unusual. A comprehensive explanation for them has not been identified because the possibilities are many.