From the introduction:
It is now the year 293 E.V., almost three centuries after the impact of Antaeus and the beginning of the Holocene Ice Age, and man’s subsequent exile beneath the waves. The surface world is uninhabitable — fast-moving glaciers cover the land, and the skies are perpetually filled with powerful electric superstorms, making even the upper 200 meters of ocean a virtually unpassable danger zone.
Humanity now exists under the waves, in vast hydrosphere cities stretching out for kilometers across the floors of the world’s oceans. It is an advanced technological society, socially governed by a worldwide system of Corporate Feudalism, combining aspects of both humanity’s future and past.
It is a prosperous world, but not without problems or conflicts. It is a world filled with unknown and unexplored depths, and as always the vast restlessness of the oceans is reflected in mankind. It is the world of EXILES.