This is a form of Watercraft that primarily operates underwater
Submarines and Spaceships have (for air-breathing Sophonts) much in common. They exterior environment is hostile to life; the Sophont's own senses are inadequate for guiding the craft and have to be supported by Sensors; the vessel is an enclosed system. They also differ. A Submarine will be immersed in an electrically conductive environment that is also chemically active. While Spaceships may be water-resistant for some considerable time, most are not designed for deep-diving in such a medium. Salt-water corrosion can become an issue if Spaceships are left wet for long periods. Spaceships are designed for pressure pushing out; Submarines are designed for pressure pushing in.
As technology progresses, the Submarine becomes one of the few methods of deploying military force that can effectively hide from and combat spaceships.
Examples of Submarines
2 Submarine items
|H-6 class Submersible||Commercial Vehicle||Water (Submersible)||5||28 dTons||Cr 500,000|
|Hunterfoil class Hydrofoil||Maritime Warship||Water (Hydrofoil/Submarine)||TBD||TBD||TBD|
Forms of underwater craft that cannot stay underwater for long periods are known as Submersibles.