The underhive is the ruined, lawless underside of a hive city, a place where the planet’s original settlements still rot beneath billions of tons of later construction. Nobody up top governs it, and nobody down there forgets that.
What the underhive actually is
A hive city grows by stitching hab-domes together with tunnels and shafts over centuries, so its interior ends up honeycombed rather than planned. The underhive is what’s left at the bottom: the oldest layers, often predating the hive itself by centuries or even millennia.
Those layers started as the planet’s first settlements. When the world’s ecology collapsed, the cities kept getting built on top, and the original streets, factories, and colony relics got buried. Some of those relics are still down there, which is exactly why people risk the trip.
Who rules down there (nobody)
Clan Houses, the Planetary Governor, and the Merchants Guild all stop caring somewhere above the underhive, and that’s the whole point. Law doesn’t reach the bottom, so gangs fill the gap.
Dome interiors are open ground split into old factory zones, housing, and commercial blocks. The tunnels between domes are where the real fighting happens, and gangs prize scouts who can actually navigate that maze without getting lost or ambushed.
- Gangs control habitable pockets, mostly for salvage and minerals.
- Information is the top trade good, especially word of ore strikes or newly opened tunnels.
- Some gangs reportedly worship ancient machines as hungry gods and feed captives to them.
Settlements and survival
Most communities are tiny, just holes and dens scratched out of ruins. Bigger ones like Dust Falls and Dead End Pass exist, walled off with stockades built from debris.
People eat what they can grow or catch: fungi, algae, rats, and mutant dogs. Larger settlements develop their own order, with trading posts, repair workshops, and services for travelers. Barter is normal, and blocked or flooded tunnels keep whole regions unexplored.
The badzones
Travelers call the underhive the badzones, and the name fits. Bandits and monsters make casual wandering fatal, so most people stick to well-worn paths. Guilder caravans, guarded by gangs or Bounty Hunters, are the main exception, and they keep trade alive between settlements.
The Imperial House has classified badzone types, which tells you how seriously the danger is taken. An Ancient Manufactorum is a forest of rusting smokestacks over abandoned machinery, with dormant forges still rumbling somewhere below. A Dome Jungle is exactly what it sounds like: local flora and fungi have swallowed the dome whole.
Key facts
- The underhive sits below a hive city, beyond the reach of Clan Houses, the Planetary Governor, and the Merchants Guild.
- It often predates the hive by centuries or millennia, since it grew from the planet’s earliest settlements.
- Hive structure is honeycomb-like, with hab-domes linked by tunnels and shafts.
- Habitable pockets are contested for salvage and minerals; information is the most valuable trade good.
- Guilder caravans guarded by gangs or Bounty Hunters are the only relatively safe way through the badzones.
FAQ
Is the underhive the same as the undercity?
In hive city terms, yes, undercity is just another word for it. Don’t confuse it with the Drukhari undercity of Commorragh, which is a completely different place.
Why does anyone live in the underhive?
Salvage, minerals, and the fact that nobody up top is stopping them. Habitable pockets are fiercely contested because they hold remnants of old machinery and ore.
What are the badzones?
Badzones is another name for the underhive, used because travel through it is so dangerous. The Imperial House has classified specific types, like Ancient Manufactorums and Dome Jungles.