The Deeps

The Deeps refers to the deeper parts of the Downworld. Below the lowest layer of fog at about 300 YB, all ability to see is gone and the pressure of the Deeps can be felt. There is immense pressure exerted that intensifies with greater depth.
The pressure below the lowest level of the fog is enough to crush most airships. Some airships, constructed with metal hulls, have been built to survive a greater depth of the Downworld, but even these cannot survive too far down. The record for the deepest an airship has gone and survived is 1000 YB.
Nobody has ever reached the bottom of the Downworld and survived. It is thought that the River Styx is at the bottom, connecting the Lower Planes.
The Deeps can also be reached by digging too far down on land. Some races are better adapted for surviving the Deeps. Dwarves and gnomes have a high tolerance for the pressure. Deep gnomes have the highest tolerance and are able to live deep underground.

Measurement

The depth of the Downworld is measured by its height in relation to Kagga, the port city in Ashun where airships were first constructed. The measurements used are YB for yards below Kagga, and YA for yards above.

Type

Natural