One day each year there is a public swim in Zürich's Limmat River. One at a time people, most with bright yellow air-filled floats, jump into the river and swim, or float, the two kilometres to the finish line. They are timed and a winner is declared, but most people just do it for the pleasure.

Today at noon when they started their Schwimmen, the air temperature was about thirty degrees Celsius. It must have been a big pleasure to be in the river in that heat.

I heard six thousand people made today's plunge.