Undercliff

*Our community needs more information on this page! Can you help out? Click here to add more.***Undercliff buildings** are buildings that can only be constructed under the cliff at the lower ground levels, or are clifftop buildings that can help you construct buildings at the lower ground levels. They are crucial for allowing the player to prepare or even transition into the mid-late game.

Their UI category color is **orange-red**.

Most of them are unlocked at Honor Points level 11, but some of them are unlocked at Honor Points level 19.

## Buildings

These are unlocked at Honor Points level 11

* Engineering Hangar
* Small Dock
* Dock Station
* Capsule Generator
* Ore Mine
* Splitting Reactor
* Geothermal Station
* Capsule Battery Station

These are unlocked at Honor Points level 19:

* Satellite Dish

## Notes

For clarification purposes, separate the Undercliff buildings into two types:

* **Undercliff preparation buildings**: these buildings are built on clifftop and is used to support/utilize the Undercliff buildings below the cliff
* **Undercliff production buildings**: these buildings are built below the cliff at the lower ground level

Undercliff production buildings have a separate power grid, and are immune to earthquakes. They are also not targeted by Marauder Attacks.

Due to the intense radiation levels, regular Drones cannot descend below the cliff to carry out any activity. Instead, Undercliff Drones from the Small Dock and the Dock Station are required to deliver or fetch items between the Clifftop and the Undercliff.

The construction costs of Undercliff production buildings are hidden behind the Engineering Hangar. When the production buildings are to be built, the Engineering Hangar will issue production orders automatically and consume Matter, Engine, and sometimes Batteries to produce large parts These large parts will then be carried by the Undercliff Drones to the lower ground level to add to the construction progress.

Therefore, **always start with an Engineering Hangar and a Dock**! Otherwise, no Undercliff production buildings can be successfully built.

Sometimes, Engineering Hangar might produce some large parts that is not used by any ongoing Undercliff construction yards, and enters a deadlock state. This can happen when there are multiple Engineering Hangars producing large parts together. In that case, perhaps it is best to rebuild the affected Engineering Hangars to reset their build queue.

## Tips and Tricks

* All Undercliff production buildings reduce global ecology. Keep that in mind when reorganizing the clifftop.
* Notice that Undercliff Drones can only return to their "host" cliff city when returning from the Undercliff region. E.g., the Undercliff Drones of City A will always deliver goods from/to City A and the Undercliff region and return to City A, but never go to City B.
* Undercliff Drones also will not work at night, to refill their anti-radioactive layers
* Geothermal power from the Geothermal Station and the Capsule Battery Station can easily and efficiently replace the Nuclear Power Plant, allowing players to easily generate a lot of power for their clifftop cities.
* The replacement of Nuclear Power Plants can help restore Ecology, which can be useful to sustain the initial global Ecology loss from the first production buildings.
* Eventually, the clifftop should have a lot of parks and/or air purifiers to offset the global Ecology loss from having many Undercliff production buildings.