When I was young, one set of grandparents lived at Gorleston - a suburb of Great Yarmouth, a seaside resort on the east coast - and in the fateful year, I stayed with them for a week in the summer. My mother (it was her parents) stayed too and one day we went out to the (model) boating pond. The pond itself was a circular man-made pool, about 50 feet in diameter and about 2 feet (half a metre) deep. My grandparents' boat was a simple model of a sailing boat - one that you put in the water and pushed it away, then ran round to the other side of the pond and waited for it to come to you. I was about 3 years old at the time and this was great fun.
One time, when my mother and gran had their backs turned, confident I knew what I was doing, I pushed it off and ran round to the other side and, when it was almost near enough to reach, I leant over.. I reached and reached for it and fell in the pond. Apparently, I forgot that it was shallow enough that I could stand up, so there I was lying face down in the pond. Also apparently, for I can't actually remember anything between reaching out and later waking up, I must have been unconscious when I was rescued.
Anyway, I woke up in an ambulance, being rushed to hospital. I almost drowned but, as you can tell from the fact that I'm writing this, I didn't.