EDITOR’S NOTE: This story includes graphic descriptions some readers may find disturbing.

The intense flurry of search activity at what was once an RV park in Kerr County, Texas, paused for a moment Wednesday morning when the body of an infant was pulled from the debris.

“You know, all of this was moving faster than it was just a minute ago. You catch the smell. You mark a dog, you have a mark and the place goes quiet,” said Joe Rigelsky, a founder of Upstream International, a Christian nonprofit involved in the grim task of searching for the scores of people missing from devastating floods that struck Texas Hill Country nearly a week ago and killed more than 100 people.

The cadaver dogs detect the scent of bodies, give a “positive mark” to their handlers and the searchers start digging into the ravaged landscape. Power saws whirred as Rigelsky spoke to CNN. Nearby, searchers on their knees dug with their hands through muddy soil and rubble. The smell of decay wafted through the air. Among the dead, Rigelsky said, are livestock and other animals that also were carried away by the fast-moving waters.

When searchers get a mark, they’ll use “equipment to hopefully clear some of the heavier debris and keep them hand poking and digging,” Rigelsky said.