Maintenance Tunnel
| “ | Prevents the decay of nearby structures when supplied. | „ |
| — In-game description |
The Maintenance Tunnel is a player-built structure designed to prevent the decay of nearby structures by consuming Maintenance Supplies in its stockpile. It can be configured to select the types of structures and the radius to prevent decay.
Construction
It can be built with a Hammer and costs 50 Basic Materials. Friendly Maintenance Tunnels are always visible on your map with a unique icon 
.
Reservation
The original builder can reserve it for a Squad 
for 52 hours in the menu to prevent non-members from modifying it. The reservation can be refreshed 
by any squad member. If the reservation expires, the structure can never be reserved again. It counts as a facility so using the "Reserve Multiple" 
button on it will also reserve every other facilities built by the player and that share a common Foundation with it.
Demolition
The original builder, and squad members if reserved, can instantly demolish it 
if it was built less than 3 hours ago. The materials used in the construction are refunded and dropped under the player.
Destruction
It is immune to Friendly Fire but it can be flagged for "Disruptive Structure Placement" 
in its menu to remove the immunity (5 "votes" needed)
Use
Its interface can be accessed on foot or from the driver seat of a logistics vehicle by pressing E.
Decay Prevention
It prevents the decay of nearby structures by consuming Maintenance Supplies placed in its stockpile. Unlike Bases, its menu allows you to manually adjust the supply range (between 0 and 100 meters) and filter the types of structures players want to protect from decay. The filter categories are:
- Defenses
(Pillboxes, Watch Towers, Walls, deployed Tripods, etc...) - Bunkers
(Trenches, Dug Foxhole, Bunkers) - General
(Encampments, Storage Box, Fire Pit, Maintenance Tunnel, Field Bridge, Field Hospital, etc...) - Facilities
(Facilities except power related ones, Pipelines, Catwalks) - Mines
(player built Resource Mines) - Power
(Power Poles, Diesel Power Plant, Power Station). - Foundations
(Foundations, Small Gauge Railway Tracks, Railway Tracks, Provisional Roads, etc...) - Shippables
(all shippable structures, such as Emplacements, Ship Parts, Rocket Parts, etc...)
The Maintenance Tunnel consumes 1 Maintenance Supplies per hour per decaying structure, with some structures consuming more. The current hourly Maintenance Supplies consumption rate is displayed by putting your cursor on the tiny Maintenance Supplies icon in the top right of the menu.
Maintenance Supplies crates can be directly submitted into it, putting their contents into the stockpile.
You can check the amount of supplies in a Maintenance Tunnel by putting your cursor on its icon on the map.
The decay prevention also slowly repairs the damage done by decay.
A Maintenance Tunnel always try to prevent its own decay even if all filter categories are off.
Trivia
- The model for the Maintenance Tunnel is the same as the old Tunnel Network
- Maintenance Tunnels were introduced in Update 1.50 (officially known as 'Inferno') in response to community concerns regarding Facilities and supplying them with enough Garrison Supplies (which later changed to Maintenance Supplies)
- They could only hold 1,000 Garrison Supplies
- When given Construction Materials and 2 MW of power, it could produce its own Garrison Supplies
Video Tutorial
Gallery
The menu of the Maintenance Tunnel
A fully constructed Maintenance Tunnel
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