The Piscina system lies approximately 6000 light years east of the eye of terror. The system is composed of 8 planets and many satellites, of which at present only one of the two habitable planets, Piscina IV, is populated by humans. With most of its surface covered by raging oceans and the only landmasses present being the tips of massive volcanoes, life on Piscina IV is unique.
Piscina IVs' industry is mainly ocean based. Massive factory ships and under water harvesters reap a rich harvest of plant and animal life while enormous mining operations, both sea and land based , provide the crucial boost to their economy. The main resource for energy is based on the ancient thermal vents dug deep in to the volcanic bedrock, which provide geo-thermal energy to the turbines on the surface, which then generate massive amounts of electricity. These gargantuan generators, transmit power to the cities and towns by an extensive electrical grid.
Due to the unpredictable nature of the tides, which may rise as high as 1000 meters, all cities and towns are situated at high altitude. The largest land mass is Kadillus with the capital, Kadillus Harbour situated there.
On 4021997.M41 Piscina IV was invaded by a Waagh led by Ghazhkull Uruk Thraka and a bad mMoon Warlord, nazdreg Urd Urdgrub. They were testing a new long range teleporta technology. Fortuitously the third company of the Dark Angels under the eladership of Master Belial was there on a recruitment drive. After a hard fought and brilliantly conducted campaign, the orks were banished from Piscina.
(Ref: Storm of Vengeance Rule Book)(Ref: Codex Imperial Guard, 2nd ed; Page 11)