Bunker

**Versioning**

This article *could* contain outdated information that is inaccurate for the current version (1.52) of the game. It was last updated for 0.49.

## View Structure Health

The **Bunker** is a player made rectangle structure, partly in the ground. There exist 3 tiers of bunkers; the first is dug with a Shovel, the second is upgraded via Basic Materials and the third tier costs Concrete Materials and a significant amount of time to cure. They can be upgraded with add-ons or converted to other types of structures like garrisons. Bunkers can also be connected to Trenches.

## Description

The **Bunker** can be made by equipping a shovel and opening the build menu (default: B). You can rotate the bunkers as you would with normal structures, but it can also snap to bunkers or to trenches (hold `Shift` to disable snapping). If you directly join two bunkers together, the wall between them disappears and the two sections become one single structure with shared health. If one of the parts gets destroyed, they all get destroyed.

There is no limit on the amount of bunkers you can link together, however, their Structural Integrity will decrease. This results in the structure having less health; the health of a 2-bunker structure is lower than the sum of the health of two separate single bunkers. The Structural Integrity will decrease quicker for low tier bunkers than for higher tiers.

Bunkers can be repaired using a hammer and Basic Materials. Upgrading a T1 bunker into a garrison or into Tier 2 requires Basic Materials. Tier 3 bunkers require Concrete Materials.

Bunker Corners are an alternative type of Bunkers in a some-what triangular rather than square shape.

## Structural integrity

When you go into the upgrade-mode, you can see bunker's approximate structural integrity in text such as high, medium, low, and critical.

The max health of a bunker structure is equal to the sum of the max health of each directly-connected bunkers multiplied by the structural integrity value.

Structural Integrity Levels
 Medium
 Low
 Critical

Factors affecting structural integrity include:

* **Bunker tier** (higher tier keep higher integrity)
* **Number of connected bunkers** (the more pieces, the lower the integrity)
* **Number of bunker garrisons, ammo rooms, and engine rooms** (they decrease integrity)

Factors that do no affect structural integrity: shape of the bunker and add-ons.

You should never let your bunkers reach Critical as your bunker's health and repair costs will suffer. Reaching Low is not advised, and adding more bunker pieces past Low integrity does not give more health to your bunker.

As a rule of thumb, a Tier 1 Bunker should not use more than 4 pieces and never more than 7. Tier 2 Bunker should not use more than 12 pieces and never more than 20. Tier 3 Bunkers are such that the number of pieces is virtually not an issue.

When modifying a bunker, each upgrade's description mention a "Structural Integrity Rating" to indicate the relative impact of each type of modification on the Structural Integrity. "High - High" means a relatively low impact whereas "High - Critical" means a very significant decrease in structual integrity.

## Upgrading Bunkers

The hammer needs to be equipped to upgrade Bunkers. Press `F` to switch the hammer to Upgrade Mode. When next to a bunker, aim at it and press the "use" key (default keybind `E`) to open the bunker upgrades menu. For options that have a direction put your cursor on the particular option and use the `Mouse Wheel` to choose the desired direction. Press `LMB` to select the option. If the upgrade is simply an Add-On, it will be installed after your character does a short animation (and if you have the required materials). For other upgrades you must hit the blueprint with your hammer while having the required materials in your inventory. If the blueprint is shot enough before it is completed, it will turn back into the original building.

### Add-ons

Similar to the Trench, the bunker can be upgraded with a set of add-ons. Building the add-ons is similar to upgrading, but when selected your character will go into a short construction animation after which the add-on will appear. The materials will automatically be taken from your inventory.

### Modifications

Beside upgrading the tier or placing add-ons, the Bunker can also be modified. This ranges from adding a spawn point with the Bunker Base to adding active defenses, as well as placing the mighty Storm Canon. Below you can find a list of all the various modifications. It should be noted that some defenses cannot be constructed on all tiers. There is no way to remove a modification from a bunker. Placing a modification will erase the existing add-ons and infrastructure modification that conflict with it (e.g. sandbags & ladder add-ons removed when placing a bunker garrison, infrastructure modification removed when placing an engine room).

When adding Garrisons to your bunker complex, be aware that they cannot be directly adjacent to each other. There can also only be one Bunker Base per complex.

### Infrastructure Modifications

Within the Upgrades section there are also **Infrastructure Modifications**, a list of which can be found in the table below. Depending on their Infrastructure Type, they give different upgrades. Each Infrastructure Modification gives 1 modification point and costs 50  to build.

Garrison Upgrades, represented by the  icon, allow for the construction of Infantry Garrisons (Rifle Garrisons/Machine Gun Garrisons; 4 modifications), AT Gun Garrisons (12 modifications), and Howitzer Garrisons (24 modifications).

Command Modifications, represented by the  icon, allow for the construction of Observation Bunkers (6 modifications), Concrete Structures (12 modifications), a Deployment Point (24 modifications), and the Advanced Bunkers upgrade (40 modifications). A Deployment Point allows players to spawn at that location from the Home Regions, while Advanced Bunkers allows the construction of Storm Cannons and Intelligence Centers.

In addition, each modification has a second type represented by the Bonus Type section. For modifications with the  icon, each modification gives a 1% chance for a soldier not to consume Soldier Supplies upon respawning. This chance maxes out at 10%. Modifications with the  icon each give a 2% speed increase to AT Gun Garrisons and Howitzer Garrisons, with a max of 40% speed increase. On a Howitzer Garrison, this changes their response time from 10 seconds to 6 seconds. Modifications with the  icon each give a 1% reduction in the power cost of Storm Cannons or Intelligence centers, up to a max of 20%. Finally, modifications with the  icon give a 1% range bonus to Observation bunkers, up to a maximum of 20%. *Note: This range bonus is not shown on the map, but will catch players outside of the shown range, but within this bonus range.*

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

## Bunker Husk

When a bunker is destroyed, it leaves behind a husk. The bunker can be rebuilt from the husk by using the hammer in upgrade mode and pressing `E`. This will replace the husk with a bunker blueprint at the tier it used to have, for the cost of that tier (e.g. shoveling for Tier 1, Hammer and 75 bmats for Tier 2). If the bunker had a modification (Rifle Garrison, Bunker Corner, etc...) then rebuilding it won't restore any of the previously installed modifications or add-ons, they'll have to be reinstalled at normal cost after bunker reconstruction. However if the bunker had no modification then all add-ons and infrastructure are restored when the bunker is rebuilt.

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

The husk can be destroyed with explosives, to make space for different structures for example. The bunker husk has the same max health as the bunker it comes from. Or you can wait for decay to destroy it. Husk decay cannot be prevented and is usually the same speed as the decay near region borders.

## Reservation

Like for Trench, the original builder of a bunker can reserve it for its active squad  or a particular squad  in the upgrade menu so that only the original builder and the players in that squad can modify the bunker or attach other structures to it. The reservation lasts 50 hours but it can be refreshed  at any moment by the original builder or their squad mates (refresh all connected bunkers).

The original builder can reserve a single bunker  or the whole group of connected bunkers .

Only the original builder can remove the reservation.

## Demolishing

Bunkers that are less then 3 hours old can be demolished by the original builder or members of their squad through a button in the upgrade menu. There must be no enemies nearby and it doesn't work for concrete bunkers. The demolition is instantaneous and leaves no husk.

Demolishing option is also available for bunker blueprints (unfinished construction).

## Tips

* Upgrading T1 Rifle Garrison to T2, T3 Rifle Garrison is cheaper than build T2, T3 bunker first and upgrade 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.
* You can hold shift while placing bunkers to prevent them from automatically connecting to another bunker or trench.
* "Nearby" on Infrastructure Modifications refers to trench/bunker distance not linear distance, this being within 40 unit pieces of the infrastructure modification.
* When a bunker is destroyed every infantry in it dies. Even vehicles that touch the bunker might be instantly destroyed.
* Infrastructure Modifications can be placed on bunker pieces who already have a bunker garrison upgrade (Rifle Garrison, etc).

## Gallery

* Howitzer Garrison and a soldier carrying a Storm Cannon shell.
* Bunker Blueprint, Shovel required to build.
* Storm Cannon.
* Engine Room.
* Various upgrades: (in order) Tier 1 Garrison, Tier 2 Machinegun, Tier 3 AT, Engine room; Firing Ports, Doorway, Trenches with Barbed Wire, a Trench Bridge, and Pipes.
* Engine room adversely affects integrity.
* Trench's length is equal to two connected bunker's length.
* Tier 1 Trench and Bunker husks.
* Bunker upgrade descriptions list Structural Integrity Rating, construction requirements, power consumption, and building cost.