When I was at primary school, a wee boy in a couple of classes down was sledging one winters weekend, and accidentally steered his sledge onto a frozen river, fell through the ice, and drowned.
We got told about it on the Monday by the headmaster.
I won’t go onto any frozen body of water now unless I am confident I know it is safe. In fact, I don’t know how to tell if it’s safe, so I generally don’t bother. Walked out about 3 metres onto a frozen loch last year, people playing out on it, but heard a crack and promptly went back.
I’d imagine being trapped in frozen water under ice is a horrible way to go.