Location from Dune by Frank Herbert
The technology planet — a subterranean factory-world that produces machines skirting the edge of Butlerian Jihad prohibitions, where innovation is both currency and heresy.
The hum of machinery is constant underground — a vibration felt through the floors, the walls, every surface. The air is climate-controlled to precise tolerances, carrying the clean smell of ozone and lubricant. Ixian technology operates at the bleeding edge of what the Butlerian prohibitions allow, and frequently beyond it. No-ships, navigation machines, hunter-seekers — the devices that shape galactic politics are born here. The Ixians walk a razor's edge. Their machines are indispensable to every Great House, the Spacing Guild, and the Emperor himself. But the prohibitions against thinking machines are religious law, and the Bene Gesserit and the Bene Tleilax both watch Ix with predatory attention, waiting for the moment innovation crosses into heresy.
The surface is unremarkable — temperate, sparsely populated. The real Ix exists underground: vast caverns converted into manufacturing complexes, lit by artificial suns suspended from cavern ceilings kilometers overhead. Assembly lines produce devices of extraordinary sophistication. The architecture is functional but elegant — Ixians take pride in the beauty of their engineering.
Also known as: the Machine Planet, Richese's rival