The Story 

1100 Years after the great World War 3 the earth was laid into a postnuclear wasteland.
The polar icecaps melted and raised the waterlevels by 1 km thus water covering 95% of the planet. The last survivors was forced into sancturary under water where they could live shielded from the high levels of radiation while planning for leaving the planet in search of a new start.
Now governed by three ideologic factions, the underwater world lies free for personal exploration and exploitation.

 The Game