Basically, an underwater vehicular combat sim, created by now defunct German developer Massive Development (not to be confused with Swedish studio Massive Entertainment). The game is a direct sequel to their earlier title Archimedean Dynasty (a.k.a. Silent Running, which takes place in the same fictional universe a few years prior. In the future, due to World War Three and an antimatter meteorite, civilisation will be forced to emigrate and live in underwater stations in the depth of the ocean.