The main source of water for the UDS outside of Earth, desalinization plants and water purification plants dot the surface of Callisto. Even though Callisto is relatively distanced from the center of activity in the System, it has proven to be a growing community, with such major Bio-Dome cities like Valhalla and Asgard being the two largest individual Bio-Domes in the system. Callisto’s population is nearly 250,000 people (But of course the UDS counts AI programs and the Neo-sentient dolphin workers towards this total).

The MIDI on this page is the main theme from the movie, "Waterworld”