The pool was full but no one was in it

I'm doing the morning check and the water is running laps by itself — same ninety-minute rhythm, same flip turn at the deep end — and I keep thinking I should call out to the regular, but the lanes are empty and the ripple just keeps swimming. The chlorine smell was so sharp it woke me up, and I sat there in the dark half-listening for a splash that wasn't coming. Tended the empty pool all day anyway. Habit's a kind of company, I guess.