The Earth has long lost habitability on the surface, but humanity survives beneath the waves, in aquatic habitats ranging in size from small units all the way to cities that almost match those that once existed on the surface. Some of these are ruins, explored and salvaged for their precious salvage and treasures. The sea life is strange, mutated by changing climate and genetic experiments. Play a salvager, pirate, settler, anything else, and try not to drown in this strange Aquatic World.