Those of you who live in Utah may have heard about the recent drownings or near drownings of several children here in the state. Then I think yesterday it was reported that Bode Miller's child died from drowning. This is such a heart breaking thing to me, and I feel for these families so much. Please take a moment to read the linked article, as it could help prepare you for a situation like this with your own family: https://www.soundingsonline.com/voices/drowning-doesnt-look-like-drowning
I have some personal experience with this. I was pulled off the bottom of a pool when I was 3.5 years old. I wasn't breathing, and I appeared to be dead. Thankfully, an aunt who was there had just finished a CPR course, and she saved my life. Even still, I had to spend several days in the hospital.
More recently, we were at a hotel pool with my wife's siblings and their children. I was one of two adults watching the kids, and had a towel-wrapped toddler in my arms sitting on the side after he and I got out of the pool. My then 4 year old was still in the pool. My toddler sneezed on me, and it was gross, so I put him down on the pool chair and I started for the bathroom to get some tissue. But then, thankfully, I turned to check on my 4-year-old. Just a few seconds before he had been holding onto the side of the pool, but now he was in the middle of the pool, with the crown of his head just at the surface of the water. As the article says, it didn't look like drowning because he wasn't thrashing, but that's exactly what it was.
I dove into the pool, and pulled him up. He coughed and sputtered a bit, but was fine. Just a few seconds more, if I hadn't turned around to check before going into the bathroom, and the story might have been very different.
The thing is, in both cases--with me as a child, and with my own son--there were several people around. You don't think that it can happen like that, but it CAN happen, and it can happen all too quickly.