I was aimlessly swimming underwater in the deep end of a backyard pool when I saw an infant on the bottom, next to one of the side walls. I grabbed it, rushed it to the surface, and sat it on the edge. Her parents quickly came running. The kid was fine. It seems she instinctively held her breath once submerged and wasn't under very long. The parents weren't watching (they were in lawn chairs 10-20 feet away) and nobody really knows how long she was under. I'm still struck by the parents' neglect. Also that the kid had no buoyancy and sank like a stone.