Making a Splash (1984)

The film begins with a view of drops of water falling into water, and shots of fish, insects and other creatures in water. The film then moves to the location of a swimming-pool, and looks at the activities of people in water, all accompanied by the music of Michael Nyman. It concludes with a performance of synchronised swimming.

Greenaway on Making a Splash:

"The thesis is simply everything that happens in water, from Darwinian evolution - from amoebae up to sophisticated swimming items like dolphins - and then moving on to everything human beings do in water, such as athletics; it ended up with the most sophisticated of the water sports, synchronised swimming. Again, all cut to a specially composed Michael Nyman piece."

IMDb