This article in Slate is an excellent guide to spotting the signs that someone is drowning, which looks nothing like you think it does.

I nearly drowned as a child. More than once, actually (I am that dumb). I went too far under with a snorkel, breathed in a lung full of water, and then couldn’t get myself back to the surface. Luckily, a bystander knew the signs.

Link: SLATE | Drowning Doesn’t Look Like Drowning