The “Waterworld” shows the World after Apocalypses caused by the melting of polar ice and rising sea level that left all the world underwater. Human population survived in small communities occupying some artificial island. They use small boats and ships for transfer. People have ability to stay underwater for long time.
Collins, Max Allan, Peter Rader, and David Twohy. 1995. Waterworld: a young adult novel. New York: Boulevard Books.