This article is timeless and should be accurate for any version of the game.
The Bunker Base (colloquially known as BoB or BB) is a Bunker modification that acts as a Forward Base and provides Infrastructure for nearby connected Bunker and Trench segments. It can be upgraded for additional health and resistance.
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A large forward operating base. Players can spawn and stockpile items here.
Must be part of a bunker complex with at least 6 bunker pieces (any tier, any upgrade)
Not be adjacent to a bunker with a garrison modification.
Defense
It's pretty sturdy but it takes damage from 12.7mm machine gun fire and isn't particularly resistant againt heavy explosives.
It has a built-in ramp that gives players access to the bunker complex interior.
The flag on top of it indicates the status of its garrison and the wind direction.
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A large forward operating base. Players can spawn and stockpile items here.
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— In-game description
Construction
The Tier 2 Bunker Base is built by upgrading a Tier 1 Bunker Base that has unlocked the Small Garrison upgrade with a Construction Vehicle and 100 Basic Materials. It needs be part of a bunker complex with at least 6 bunker pieces (any tier, any upgrade).
Defense
It's very sturdy and pretty resistant to most damage types except Demolition.
It has a built-in ramp that gives players access to the bunker complex interior.
The flag on top of it indicates the status of its garrison and the wind direction.
“
A large forward operating base. Players can spawn and stockpile items here.
„
— In-game description
Construction
The Tier 3 Bunker Base is built by upgrading a Tier 2 Bunker Base that has unlocked the Large Garrison and Concrete Structures upgrades with a Construction Vehicle and 25 Concrete Materials. It needs be part of a bunker complex with at least 6 bunker pieces (any tier, any upgrade).
The concrete takes 24 hours to dry during which the structure is more vulnerable the wetter it is.
Defense
It's extremely sturdy and very resistant to most damage types except Demolition. It has a ladder that gives infantry access to an elevated position with cover.
It has a built-in ramp that gives players access to the bunker complex interior.
The flag on top of it indicates the status of its garrison and the wind direction.
Bunker Base Upgrades
Bunker Base upgrades contain the same upgrades as other Forward Bases but also have two additional upgrades trees ("Garrison" and "Command") to unlock bunker specific upgrades. Those bunker upgrades also require Infrastructure, which is provided by building Infrastructure Modifications in Bunkers connected to the base by bunkers/trenches. There are two types of Infrastructure: "Garrison" and "Command" , one for each upgrade tree.
Image
Name
Required Infrastructure Modifications
Description
Approx. Unlock Time
"Base" Tree
Provisional Garrison
A Provisional Garrison connects the base to nearby defensive structures (80m radius). Defensive structures will deactivate if player activity (set spawn) is too low (<10).
5 mins to 5 hours
Small Garrison
A small Garrison permanently connects the base to nearby defensive structures (80m radius).
Required to upgrade Base to Tier 2.
8-72hrs
Large Garrison
A large Garrison permanently connects the base to nearby defensive structures (80m radius).
Once an upgrade for a specific bunker garrison is unlocked, bunkers that are connected to the bunker base via trenches or bunkers can be modified to become that specific bunker garrison type (if they don't already have a modification installed). The maximum range of the bunker tech is a chain of 40 connected bunker/trench pieces (distance to Bunker Base is irrelevant), i.e. the tech doesn't reach a bunker if the shortest connection to the bunker base is a chain of more than 40 trench/bunkers. Once a particular bunker has been modified into a bunker garrison it won't lose its modification if its connection with the bunker base is severed, it can even still have its tier upgraded.
The bonuses from the Infrastructure Modifications however need to always be connected to a particular piece (and to a Bunker Base) to apply their bonus to it.
Husk
When destroyed the Bunker Base leaves behind a "husk" that can be rebuilt. Reconstruction uses the same tool and materials as for the construction of the tier it was on (i.e. CV and 25 Concrete Materials for Tier 3 Bunker Base).
If the faction which previously owned the base rebuilds it then it regains all the Stockpile and every Base Upgrades that were unlocked. But if the enemy faction captures it by rebuilding it then the base keeps 25% of its stock (none of the Soldier Supplies or Maintenance Supplies) and loses all its base upgrades.
The husk has much more health than its live counterpart (4000 Tier 1, 20000 Tier 2, 40000 Tier 3) but it can be destroyed permanently to prevent the enemy faction from rebuilding it.
Tips
Once an upgrade that required Infrastructure Modification is unlocked, removing those modifications won't make you lose the upgrade or its ability to build new bunker upgrades
This is particularly useful if the builder only wants certain modifications, and doesn't want to deal with the increased maintenance cost
Bunkers and Trenches connected to a Bunker Base (via trenches or other bunker pieces) are not neutral structures and are owned by the respective Bunker Base's faction
Small Modifications on them cannot be removed by the opposing faction
Bunker Bases and the bunker pieces attached to them are immune to friendly fire, unlike Encampments.
It is still possible to destroy most friendly bunkers that have a Bunker Base, or to selectively cut off pieces, join your faction relevant building discord to learn how to.
A destroyed Bunker Base can be rebuilt without the required 5 additional bunker pieces, allowing players to have a Bunker Base with no other bunker pieces attached to it
There are ways of making a 1x1 Bunker Base that do not require enemy damage or decay, join your faction relevant building discord to learn how to.
