Bunker

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Versioning

This article could contain outdated information that is inaccurate for the current version (1.57) of the game. It was last updated for 1.56.

A Bunker is a player-built structure partly-dug into the ground with a Shovel. It can be upgraded for more Health and better Resistance and transformed with various Modifications. It can be connected to other Bunkers and Trenches.


An underground shelter that serve as foundation for permanent fortifications. Connects to other Bunker and Trenches.
In-game description

Construction

A Tier 1 Bunker is built with a Shovel. It can be connected to other Bunkers by their sides and to Trenches by their ends or their center (hold Shift to deactivate auto-snapping). It can't be built on Beaches, paved areas, ice, roads, or steep slopes.

Structural Integrity

The Tier 1 Bunker greatly decreases the Structural Integrity of its Bunker Network.

An underground shelter that serve as foundation for permanent fortifications. Connects to other Bunker and Trenches.
In-game description

Construction

A Tier 2 Bunker is built by upgrading a Tier 1 Bunker with a Hammer and 75 Basic Materials.

Structural Integrity

The Tier 2 Bunker slightly decreases the Structural Integrity of its Bunker Network.

An underground shelter that serve as foundation for permanent fortifications. Connects to other Bunker and Trenches.
In-game description

Construction

A Tier 3 Bunker is built by upgrading a Tier 2 Bunker with a Hammer and 15 Concrete Materials. However it needs to be connected (by trench or bunker) to a Bunker Base with the Concrete Structures CivicMaterialsIcon.png upgrade.

Concrete Settling

It must dry off for 24 hours before it can be modified or upgraded. The duration increases during Snow Storms and Rain Storms depending on their intensity (up to double with highest intensity).

While very sturdy when dry, it is vulnerable while still wet. The vulnerability depends on how wet the concrete is and functions as a damage multiplier. Wet concrete that's just been placed has a x10 damage multiplier compared to dry concrete. After 8 hours the damage multiplier is roughly x3, and x2 after 12 hours.

Structural Integrity

It very slightly decreases the Structural Integrity of its Bunker Network.

Bunker Network

If you directly join two bunkers together, the wall between them disappears and they become one single Bunker Network with shared health. If one of the parts gets destroyed, they all get destroyed.

Modifications

Modifications can be added to a Bunker with a Hammer in "Upgrade" mode (switch with F), press E to open the upgrade menu.

Small Modifications

Adding a Small Modification makes your character perform a short construction animation after which the modification appears. The materials will automatically be taken from your inventory. Use Mouse Wheel to select the orientation and position of the Small Modification when relevant. They can be removed by pressing Right Click on their icon option in the upgrade menu instead of Left Click.

Name Icon Description Cost Removal Cost
Doorway BunkerT1DoorwayIcon.pngFortT2DoorIcon.pngBunkerT3DoorwayIcon.png Provides entry into this Bunker. 20 BasicMaterialsIcon.png 10 BasicMaterialsIcon.png
Firing Port BunkerT1FiringPortIcon.pngFortT2WindowIcon.pngBunkerT3FiringPortIcon.png Allows infantry weapons to be fired from the safety of this bunker. However heavy weapons (Machine Guns, etc...) can't be rested on the firing port ledge. 20 BasicMaterialsIcon.png 10 BasicMaterialsIcon.png
Pipes EngineRoomPipeIcon.png Provides power connections from Engine Rooms to Storm Cannons and other powered bunker pieces, such as garrisons. 30 BasicMaterialsIcon.png 15 BasicMaterialsIcon.png
Interior Firing Port FortT3InteriorFiringPortItemIcon.png Provides cover against enemies that have entered this Bunker. Tier 3 only. 10 BasicMaterialsIcon.png 5 BasicMaterialsIcon.png
Stairs FortT2StairItemIcon.png Allows easy access to the roof of this bunker. Only Tier 2 and 3. 30 BasicMaterialsIcon.png 15 BasicMaterialsIcon.png
Ladder FortT2Roof02ItemIcon.png Permits access into this Bunker from the roof. Only Tier 2 and 3. 20 BasicMaterialsIcon.png 10 BasicMaterialsIcon.png
Sandbags SandbagsStructureIcon.png Bunker Sandbags gives a secure firing position on the roof while preventing enemies from climbing onto your bunker. 1 SandbagMaterialItemIcon.png 20 BasicMaterialsIcon.png

Infrastructure Modifications

An Infrastructure Modification can be installed inside a Bunker if it's connected to a Bunker Base. Each cost 50 BasicMaterialsIcon.png and give different bonuses to the connected bunkers depending on their Infrastructure Type. Removing them cost is 25 BasicMaterialsIcon.png. They contribute to the Infrastructure requirement to unlock the Base Upgrades at all the connected Bunker Base nearby.

Some infrastructure modifications only become available after a certain amount of infrastructure modifications of the same infrastructure type have already been built.

The Infrastructure bonuses are no longer applied to a particular bunker if its trench/bunker connection is severed.

An infrastructure modification always rests on a bunker wall. Use Mouse Wheel to select the desired position during placement. It can't be installed in bunkers that do not have walls (e.g. middle of a 3x3 bunker network).

Garrison IconInfrastructureGarrison.png Infrastructures

They are needed to unlock Infantry Garrisons InfantryGarrisons.png (4), AT Gun Garrison FortT3ATGunAIIcon.png (12), and Howitzer Garrison FortT3HowitzerAIIcon.png (24).

Name Icon Bonus Type Required Modifications
Bunks FortImodBunkBedIcon.png +1% chance for a soldier not to consume Soldier Supplies upon respawning (max 10%) None
Lockers FortImodLockerIcon.png +1% chance for a soldier not to consume Soldier Supplies upon respawning (max 10%) None
Latrine FortImodLatrineIcon.png +1% chance for a soldier not to consume Soldier Supplies upon respawning (max 10%) 5 IconInfrastructureGarrison.png
Wash Station FortImodDishwashStationIcon.png +3.33% fire rate to AT Gun Garrisons and Howitzer Garrisons (max 66.6%) 10 IconInfrastructureGarrison.png
Kitchen FortImodKitchenIcon.png +3.33% fire rate to AT Gun Garrisons and Howitzer Garrisons (max 66.6%) 15 IconInfrastructureGarrison.png
Pantry FortImodPantryIcon.png +3.33% fire rate to AT Gun Garrisons and Howitzer Garrisons (max 66.6%) 15 IconInfrastructureGarrison.png

Command IconInfrastructureCommand.png Infrastructures

They are needed to unlock Observation Bunkers ObservationBunkerT3ItemIcon.png (6), Concrete Structures CivicMaterialsIcon.png (12), Deployment Point IconFacilitiesDeploymentPoint.png (24), and Advanced Bunkers AdvancedBunkerIcon.png (40).

Name Icon Bonus Type Required Modifications
Workstation FortImodDeskIcon.png -1% power cost of Storm Cannons or Intelligence centers ( max 20%) None
Computer Module FortImodModuleIcon.png -1% power cost of Storm Cannons or Intelligence centers ( max 20%) None
Radio Station FortImodRadioStationIcon.png +1% range to Observation bunkers (max 20%) 10 IconInfrastructureCommand.png
Chalk Board FortImodChalkBoardIcon.png +1% range to Observation bunkers (max 20%) (Not shown on the intel circle size on the map) 10 IconInfrastructureCommand.png
Strategic Map FortImodStrategicMapIcon.png +1% range to Observation bunkers (max 20%) (Not shown on the intel circle size on the map) 15 IconInfrastructureCommand.png

Structure Upgrades

A Bunker can be modified into various specialised structures. Only one Structure Upgrade can be installed and it cannot be removed once built. It deletes all Small Modifications and Infrastructure Modifications that are in conflict with it (e.g. sandbags & ladder add-ons removed when placing a bunker garrison, or infrastructure modification removed when placing an engine room).

Most Structure Upgrades require that the Bunker is connected by trenches or bunkers to a Bunker Base with certain base upgrades unlocked. The direct chain of bunkers and trenches linking them must have 40 or fewer pieces (including the Bunker itself and the Bunker Base).

The upgrade's impact on its Bunker Network's Structural Integrity is mentioned in the description. "High - Medium" means the integrity is currently "High" (0.75-1) and will become "Medium" (0.5-0.75) if the upgrade is added.

Name Icon Description Requirements
Bunker Base FortT1BaseIcon.pngFortT2BaseIcon.pngFortT3BaseIcon.png A large forward operating base. Players can spawn and stockpile items here. Built with a Construction Vehicle Only on Tier 1 bunkers.

Only one per Bunker complex

Bunker Ramp FortT1RampIcon.pngFortT2RampIcon.pngFortT3RampIcon.png A ramp that provides access to underground Bunkers.
Bunker Corner FortT2CornerIcon.pngFortT3CornerIcon.png Makes the bunker triangular. Tier 1 built with shovel. Only on Tier 1 or Tier 2 bunkers.
Rifle Garrison FortT1GunAIIcon.pngFortT2GunAIIcon.pngFortT3GunAIIcon.png An entrenched bunker manned by stationed troops armed with Rifles. Infantry Garrisons InfantryGarrisons.png

Cannot be adjacent to another garrison Upgrade, even diagonally.

Machine Gun Garrison FortT1MGunAIIcon.pngFortT2MGunAIIcon.pngFortT3MGunAIIcon.png An entrenched Machine Gun emplacement manned by stationed troops. Infantry Garrisons InfantryGarrisons.png

Cannot be adjacent to another garrison Upgrade, even diagonally.

AT Gun Garrison FortT2ATGunAIIcon.pngFortT3ATGunAIIcon.png An entrenched AT gun manned by stationed troops. AT Gun Garrison FortT3ATGunAIIcon.png

Only on Tier 2 and Tier 3 bunkers.
Cannot be adjacent to another garrison Upgrade, even diagonally.

Observation Bunker ObservationBunkerT2ItemIcon.pngObservationBunkerT3ItemIcon.png A radio bunker that provides intel to friendly units about the surrounding area. Reinforced with wood, it can withstand more punishment than a standard radio tower, and therefore is capable of increased effectiveness. Observation Bunkers ObservationBunkerT3ItemIcon.png

Only on Tier 2 and Tier 3 bunkers.
Cannot be adjacent to another garrison Upgrade, even diagonally.

Engine Room EngineRoomIcon.png An engineering facility that provides power to Bunker structures using pipe connections. Only on Tier 2 and Tier 3 bunkers.
Storage Room AmmoRoomIcon.png A Bunker Room designed to hold large amounts of large items. Crates of these items can be directly submitted. Only on Tier 2 and Tier 3 bunkers.
Bunker Hearth FortFirePitIcon.png A hearth that warms up soldiers during Snow Storms when fueled with Diesel.
Howitzer Garrison FortT3HowitzerAIIcon.png An entrenched Howitzer emplacement manned by station troops. Howitzer Garrison FortT3HowitzerAIIcon.png

Only on Tier 3 bunkers.
Cannot be adjacent to another garrison Upgrade, even diagonally.

Storm Cannon LongRangedArtilleryIcon.png A heavy fixed position artillery that can release devastating firepower on distant enemy targets. Advanced Bunkers AdvancedBunkerIcon.png

Only on Tier 3 bunkers.
Cannot be adjacent to another garrison Upgrade, even diagonally.
Requires a 3 by 3 bunker complex.

Intelligence Center IntelligenceCenterIcon.png A high-tech listening post designed to intercept and decode enemy transmissions. The intelligence Center can target distant locations and will continue to decipher sensitive transmissions over a sustained period. Advanced Bunkers AdvancedBunkerIcon.png

Only on Tier 3 bunkers.
Cannot be adjacent to another garrison Upgrade, even diagonally.
Requires a 3 by 3 bunker complex.

Reservation

The original builder can reserve it for a Squad BtReserve.png for 52 hours to prevent non-members from modifying it, upgrading it, or attaching structures to it. The reservation can be refreshed by any squad member.

Demolition

The original builder, and squad members if reserved, can instantly demolish it BtDemolish.png if it was built less than 3 hours ago. The materials used in the construction are refunded but not the ones used for the modifications. The Bunker Network it is part of is unaffected.

Reconstruction

When destroyed, it leaves behind a husk that can be either destroyed or rebuilt. Reconstruction uses the same tool and materials as the construction of its current tier (e.g. shoveling for Tier 1, Hammer and 75 bmats for Tier 2). It cannot be rebuilt if an enemy base is close (approximately less than 50m). The Structure Upgrade modification on it is lost (except Bunker Base) and will have to be reinstalled at normal cost after the reconstruction. The reconstruction restores all small modifications and infrastructure modifications but only if the bunker had no Structure Upgrade modification installed.

Unlike trench husks, bunker husks cannot be filled in with a shovel.

Actions Log

The list of all special actions done to the bunker can be viewed with the "View Action Logs" button BtLog.png.

Use

Defensive Position

It offers great cover and good firing positions for infantry, especially with some small modifications installed. Bunker interior can protect infantry against Artillery. It also slowly warms up infantry in it during Snow Storms.

Bunkers are neutral structures by default if no Structure Upgrade modification is installed on them. An enemy can add or remove small modifications and Infrastructure Modifications from your bunker unless it is connected via Trench/Bunker to a friendly Bunker Base or if it is in the same Bunker Network as a friendly Bunker with a Structure Upgrade modification installed (e.g. Rifle Garrison).

When destroyed, the husk it leaves can still be used by soldiers to hide inside it by crouching but it offers worse cover than a normal bunker or trench. All vehicles can drive over bunker husks. The husk also does not protect infantry from Snow Storms.

Spreading Base Upgrades

The Base Upgrades unlocked by a Bunker Base spread through and apply to all connected Trenches and Bunkers, up to a maximum range of 40 pieces. Bunker husks also spread Base upgrades.

Resistance

At Tier 1, it is immune to small arms and fragmentation grenades, but not to 12.7mm machine gun fire or heavier explosives. Tier 2 makes it immune to 12.7mm. Tier 3 increases its resistant to heavy explosives except Demolition explosives.

When it's destroyed, every infantry in it dies. Even vehicles that touch the bunker might be instantly destroyed.

The destroyed Bunker husk has the same health and resistance as it had when alive but its decay is faster and cannot be prevented.


Tips

  • Upgrading T1 Rifle Garrison to T2, T3 Rifle Garrison is cheaper than build T2, T3 bunker first and upgrading to Rifle Garrison. Upgrading T1 Rifle Garrison to T2 costs 75 Basic Materials and T2 Rifle Garrison to T3 costs 30 Concrete Materials like normal bunker does.
  • Infrastructure Modifications can be placed on bunker pieces who already have a bunker garrison upgrade (Rifle Garrison, etc).

Gallery

Tutorial Video