Troth Glenbeard was a dwarf with a mission. And that was destruction.
From there, things happened. And the Irondeeps got a Subterranean-Transport-System-That-Moves-Things-Around-Faster-Than-Equine-Means (aka, in modern-speak, a subway).
The Water-Rift is a massive crater in the center of the desert, in the center of which sits a large, unfathomable machine that produces water. Thusly, it is a veritable paradise in the center of the burning desert, and a unique culture exists there.