AETHUS How to Use Build Kits: Underground Deployment Guide

To use build kits in AETHUS, press the B key to open the construction interface while underground, select the subterranean tab, and place the kit like any surface structure. Fabricating these deployable deployables requires constructing an Expedition Hub at your surface outpost.

How to Deploy Build Kits Underground

Normal outpost construction commands do not function in underground tunnels until you carry finished build kits in your inventory. Once you pick up or craft an underground deployable, descend to the target cavern or facility sector.

Open the building system by pressing the default B key. From the radial or category choices that appear, select the underground option. The game displays the available structure blueprint associated with the kit you are carrying, showing a placement ghost. Align the holographic preview with the floor or structural anchor until the indicator shows blue, then confirm placement.

Deployable kits such as a subterranean power relay establish new connection points for the green power transmission lines running through the depths. Certain hazards require immediate support structures; for instance, cooling pylons require inserting two units of coolant after deployment to establish a safe thermal perimeter, while field domes establish stable oxygen zones in deep tunnels.

Unlocking the Expedition Hub

You cannot craft fresh build kits until you establish an Expedition Hub in your surface outpost. Exploring the collapsed facilities past Rho rewards an initial broken kit or data prompt, triggering instructions to return to the surface to analyze the technology.

Purchase the Expedition Hub blueprint from the outpost market terminal. Once acquired, open your outpost building interface and build the hub inside your base perimeter. Construction requires:

• 1 Advanced Electronic component
• 1 Servomotor
• Calorite bars
• Reinforced building materials

Placing the Expedition Hub unlocks specialized fabrication plans. It serves as the primary station for synthesizing empty build kits and assembling field equipment needed to survive deeper sectors.

Crafting Build Kits and Component Costs

Fabricating kits requires pre-assembled parts produced across multiple crafting tables. The basic vessel for underground equipment is the Empty Buildkit, crafted at the Expedition Hub using 5 Building Materials and 1 Tangrite Bar. If you install a Manufacturing Habitat module inside your outpost, station recipes reduce this specific cost to 3 Building Materials and 1 Tangrite Bar.

Advanced subterranean equipment combines empty kits with specialized wiring and shielding:

• Subterranean Power Relays require power cells, microcircuits, and empty frames.
• Thermal and high-temperature structures demand Magma Safe Building Material, crafted by combining deepthine ore, lava stone, and reinforced building materials.
• Specialized sensors and automated rigs require focus lenses and microcircuits.

Microcircuits require gold bars and dust ruby powder. Because subterranean infrastructure consumes large batches of circuitry, keeping track of where to find gold in the upper caverns prevents production delays at the Expedition Hub.

Subterranean Build Kit Comparison

Different sections of the mantle require specialized deployables to overcome extreme heat, severed conduits, or atmospheric decay.

Verifying Power Connections and Grid Status

Placing a build kit does not always finish the job. For power relays, verify that the green energy cables visually link between the power generator, the newly placed relay, and the target facility door or console.

If a placed relay fails to activate a facility, inspect the distance between connection points. Relays feature fixed connection radiuses. When bridging expansive magma chambers or collapsed shafts, chain multiple relays along rock outcroppings to maintain an unbroken circuit from the operational power source to the downstream terminal.