zoethe wrote an excellent entry about
how she almost drowned as a child twice and how both times help was impeded by other people. There's an excellent link to what drowning actually looks like - which - surprise - is not what you see in TV and the movies. Click on it, read it, save a life.
I used to be a lifeguard and I never had to save anyone, thank goodness. I hope I never have to. I hope you never have to. But if it's needed, I hope you know what to look for, and what to do.
N.