The boy had never much liked swimming.  It was always a hassle with the sand, salt, or chlorine, and he was never much good at treading water or any of the fancy strokes he was supposed to learn.

For some reason, he did rather enjoy diving, but others always seemed resistant to going with him.  He always kind of assumed they didn’t like it being darker or the pressure on their ears.

One day, he was out diving, and his partner was being very wimpy about the whole thing.  He thrashed around, ruining the visibility.  Did his gills not work?