Don't Dig Too Deep

Excerpt from a novel in progress:

"There are things under the ground," said Llewellyn, his deep voice deceptively calm, "though not as many as in the folk tales, nor as easy to reach. Still, there are creatures and forces which may be disturbed by deep digging in the right areas. Some will even be attracted by digging, and meet the digger halfway."
"That's enough to give me nightmares, right there," said Theal, with a wince.
"I know of a well, long abandoned and of unknown provenance, where if you listen in a quiet moment you may hear breathing," said the healer, with an impish smile.
"Thank you very much for that information," said Theal, now shivering.