Aburrey Quarry in Valley IV has no local PAC or Sub-PAC, so every powered door, elevator, and Electric Nexus in the area only works if you relay energy in from The Hub’s PAC.
Quick answer: Build a continuous chain of Relay Towers and Electric Pylons from The Hub PAC to Aburrey Quarry, respecting the 80 m (Relay Tower) and 30 m (Pylon) range limits, then branch additional towers and pylons from the quarry’s inbound Relay Tower to each facility you want to energize.
Aburrey Quarry power requirements
Energy in Aburrey Quarry comes only from the main PAC in The Hub region.
No Sub-PAC is present in the quarry, so any powered structure there depends on an unbroken transmission line that originates at The Hub PAC and reaches the quarry.
Once that line exists, Electric Nexus units and doors in Aburrey Quarry behave like those in other powered areas: they activate as soon as they are connected to a live Relay Tower or Pylon within range.
Arknights: Endfield transmission ranges for power structures
| Structure | Role | Maximum link distance |
|---|---|---|
| Relay Tower | Main long-range node in the transmission line | 80 m to the next tower, pylon, or powered facility |
| Electric Pylon | Short-range relay and branching node | 30 m to the next pylon, tower, or powered facility |
Transmission works across region boundaries, so Relay Towers and Electric Pylons placed at the edge of The Hub can pass power across into Valley IV and on toward Aburrey Quarry, as long as range limits are not exceeded.
Arknights: Endfield prerequisites for powering Aburrey Quarry
Before attempting to wire the quarry, ensure the following conditions are met:
- Unlocked and constructed PAC in The Hub
- Enough Originium ore veins rigged to sustain PAC output
- Access to Relay Tower construction
- Access to Electric Pylon construction
- Pylon Relaying researched under Basic AIC Plan II
Pylon Relaying is essential because it allows Electric Pylons to originate and forward transmissions, not only receive them.
Without Pylon Relaying, pylons cannot extend the line on their own, and the total number of towers required to cover the distance to Aburrey Quarry increases significantly.
How to extend power from The Hub PAC to Aburrey Quarry
1. Craft enough Relay Towers and Electric Pylons at the PAC
Start at The Hub’s PAC interface and queue construction of Relay Towers and Electric Pylons.
The path from The Hub to Aburrey Quarry is long and must be covered continuously, so prepare a surplus rather than the bare minimum.
2. Walk the route toward Aburrey Quarry while placing structures
Leave The Hub on foot and follow the road toward Aburrey Quarry, placing transmission structures along the way.
Each placement must respect the maximum allowed distance to the previous powered node:
- Place Relay Towers near the upper end of their 80 m radius whenever terrain allows.
- Use Electric Pylons to bridge gaps where 80 m spacing is impossible due to elevation, line-of-sight restrictions, or awkward terrain.
Every newly placed tower or pylon must be within transmission range of a node that is already part of the live chain starting at the PAC.
3. Ensure an unbroken chain across the region border
Approaching Valley IV, continue placing towers and pylons so that at least one powered node sits on the boundary between The Hub and Aburrey Quarry’s access route.
Power transmission does not stop at the region edge; as long as the next structure is inside range, the line remains live when you cross into the new area.
4. Place a Relay Tower inside Aburrey Quarry as the inbound node
Once you step into Aburrey Quarry itself, install a Relay Tower in an open, central spot that still lies within 80 m of the last node on the approach route.
This Relay Tower becomes the primary inbound node that feeds the entire quarry: all local pylons, towers, Nexus units, and powered doors must trace back to it through valid links.
How to power specific facilities inside Aburrey Quarry
Branching from the quarry’s inbound Relay Tower
From the first Relay Tower you place inside Aburrey Quarry, establish separate branches to each internal facility.
The method is identical to the main line:
- Place Relay Towers when you need to stretch up to 80 m in a straight or elevated segment.
- Insert Electric Pylons when working around obstacles, corners, or vertical transitions where a shorter 30 m hop is sufficient.
Powering doors, elevators, and Electric Nexus units
Many quarry mechanisms, including Electric Nexus units and major doors such as those near the Staff Lounge on the east side of the area, only function if they sit within range of a live transmission node.
To energize any such mechanism:
- Identify the nearest point where your existing line passes.
- Add a pylon or tower so that the device is inside the 30 m or 80 m radius of a powered node.
When a Nexus or door receives power successfully, its UI and in-world indicators change to their active state, and linked doors or elevators can be operated.
How to confirm that Aburrey Quarry is powered correctly
Power delivery to the quarry and its facilities is complete when all of the following conditions hold:
- There is a continuous sequence of Relay Towers and Electric Pylons from The Hub PAC to at least one Relay Tower located inside Aburrey Quarry.
- No gap between adjacent structures exceeds 80 m for Relay Tower links or 30 m for Electric Pylon links.
- Targeted Electric Nexus units, doors, and elevators in the quarry show active power status and respond to interaction.
If a specific structure remains inactive, the cause is always one of the following:
- The device lies outside the 30 m/80 m radius of the nearest powered node.
- One or more Relay Towers or Electric Pylons in the chain are placed too far apart, breaking the line back to the PAC.
- Pylon Relaying has not been researched, preventing pylons used as origin points from forwarding energy.
Correcting spacing or adding a missing intermediate pylon or tower immediately restores power if the PAC has sufficient output.
