Humanity built the Ark as a self-sufficient habitat, made up of hundreds of floating islands, drifting in the middle of the ocean. In the mid-21st century, The Ark lost contact with the rest of the planet. Perhaps the rising ocean levels drowned everyone not fortunate enough to live in a floating city. Perhaps it was something more horrific. Whatever the cause, the Ark's inhabitants, their descendents and tens of thousands of refugees have been confined to the Ark for 25 years. In that time, population pressure and ideological disagreements have plagued the last refuge of humanity with a brewing civil war.