From Creatures Wikia
WaterWorld is a new underwater world for all amphibious Norns and real Meernorns for C2 created by MadDoc. It is the normal Albia world, only the almost all rooms are flooded except the incubator floor, the vault below, and one floor above the desert air. The Grendel and Ettin-mother are removed, radioactivity is gone, the temperature in the volcano is normalized and the kits are enabled.
In Version 2 of WaterWorld the Bridges and Updates are already include in the world. The elevator shaft from the incubator room to the tree in the desert was divided (so fish does not fall out of the desert in the shaft down).
This world is availible at MadDoc's Welt.