"It collapsed all around him and pinned him in there.
"People there pulled him out of the hole and started CPR resuscitation. He was found deceased or lifeless. We arrived and continued the resuscitation for quite a while, unsuccessfully.
"It's horrible, it just happened while he was playing, as kids do."
Paramedics were flown to the scene of the accident by the Northland Emergency Services Trust helicopter, he said.
Residents at the popular holiday spot said it was understood the child was a local boy who had ties to an old homestead on iwi-owned land.
The accident occurred in front of the homestead on the Maori land, at the opposite end of the beach frequented by holidaymakers from a nearby campground.