Jeampier Silvera Arteta was reported missing by his family on Tuesday evening after he disappeared while playing in a sand-filled construction zone in the Colombian city of with his two brothers.
Civil defence officials suspected that the boy fell in a hole, unnoticed by his siblings.
Rescue teams searched the Sourdis neighbourhood, even the sewer, but didn't find him.
Civil defence member Herson Montenegro said he was glad they decided to do a second sweep of the sewer system"
"It was an intense search. Thank God we found the boy in one of the sweeps of the area. We had already searched the sewers the first time and we hadn't found him. Thank God the second time we searched, the boy was there. He was close to being swept into a hole in the sewer," he said.
Emergency personnel rushed Arteta to a nearby hospital where he received medical attention.
