The floating islands of Osiris, numbering ten (10) in all are divided into four (4) administrative provinces. The largest four islands make up the capitals of each respective province, with the largest, Horus, acting as the planetary capital. Each is in effect limited in size by the nature of its construction but settlement is not entirely limited to the kilometers wide constructs. Tending to be anchored in shallower waters, each city platform acts as a hub to smaller platforms and actual floating vessels. Osiris in particular sits at the centre of no fewer than 45 platforms; most of them dedicated shipyard and processing facilities to maintain the fishing fleets and the industrial vessels of the extraction flotillas.

The Sub aquatic Research Facility is also home to several hundred scientists and military officers working on the Aqua Trooper project in the high pressure environments below the surface. Large government grants and private funding for the research being done in the Facility has resulted in an extremely successful program with the largest aquatic research facility in the Empire.

The complex is one of the only on the world to actually have physical connections to the seabed, the towering spire rising from the bed of the Abydosian Shallows, a sloping expanse of reef and shallow water on the southern tropic. Guarded heavily and isolated, its value to the Emperor's Hammer is unquestionable and its research of the highest importance.