Underground Vault

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Version

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This article has been verified for the current PC version (2.7) of the game.

Underground Vault is a colony event chain that may happen 2 or 3 years after a Tomb World has been colonized. It can only happen once per game. The event chain has entirely random outcomes.

Underground Vault

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Geological surveys conducted by our colonists on [colony name] have revealed a massive vault buried deep inside a mountain range. All evidence points towards this being some kind of fallout shelter built by the same species that perished in the [planet or moon]'s ancient nuclear war.

The vault has been sealed for many centuries, but our instruments have detected a faint power signature emanating from within. Our scientists are eager to open the vault and discover what lies behind its reinforced doors.

 
Trigger conditions
  • Not capital world
  • Not Gestalt consciousness.png Gestalt Consciousness
  • Planet was not turned into a Tomb World by orbital bombardment
Mean time to happen

30 months


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Let's crack this thing open!
  • Issue Special Project: Open Underground Vault
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Best to leave that thing be.

Special Project Completed

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Our science expedition has finally managed to open the vault on [colony name], but they found nothing but ancient skeletal remains inside. It would seem that the vault's original inhabitants ran out of food approximately 200 years ago, at which point they turned on each other in some sort of cannibalistic frenzy. The scattered bones, many of them covered in gnaw marks, paint a grisly picture of the final moments that were experienced by the last survivors of this once proud civilization.

On the bright side, the logs and data libraries inside the vault should be enough to keep our behavioral scientists and xeno psychologists busy for many years to come.

 
Trigger conditions
  • Underground Vault
  • 33% chance
Is triggered only by

Finishing the Open Underground Vault special project


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Interesting.
  • Adds an D bunker door.png Underground Vault planetary feature to the colony

Special Project Completed

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Our scientists finally managed to open the ancient vault on [colony name], only to unleash a flood of mutated horrors - the twisted remains of the original inhabitants.

The creatures slaughtered the science team in a matter of seconds, and then fanned out into the countryside. Thousands of colonists have been butchered, with entire settlements falling to the ravenous horde. We have fortified our remaining cities and established defensive perimeters, but this may not be enough!

 
Trigger conditions
  • Underground Vault
  • 33% chance
Is triggered only by

Finishing the Open Underground Vault special project


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Man the defenses!
  • 3 armies invade the colony

Special Project Completed

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The great vault on [colony name] has been unsealed. To the surprise of our scientists, the vast complex behind the massive vault doors housed millions of survivors from the ancient nuclear war that once ravaged this world. Despite their limited resources, they have managed to maintain a self-sufficient society for centuries. They were wary of our scientists at first, having never encountered aliens before, but also deeply grateful for our help in opening the vault.

The vault contains large stores of equipment and machinery that was specifically designed for rebuilding civilization after a nuclear holocaust. It can only be operated by these aliens, but they seem more than willing to join your colonists on the surface once they have adapted to natural sunlight again.

 
Trigger conditions
  • Underground Vault
  • 33% chance
Is triggered only by

Finishing the Open Underground Vault special project


Event button on.png
Let us rebuild this world together.
  • Adds an D bunker door.png Underground Vault planetary feature to the colony
  • Adds 3 pops from a random species to the colony
Event button on.png
Authoritarian.pngFanatic Authoritarian.pngXenophobe.pngFanatic Xenophobe.png Excellent. Prepare the slave collars!
  • Adds an D bunker door.png Underground Vault planetary feature to the colony
  • Adds 3 pops from a random species to the colony with the Slaves citizenship
Event button on.png
Xenophobe.pngFanatic Xenophobe.png Send the alien scum back into the vault and bury the entrance.

Mutants Overrun [colony name]

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Our main forces on [colony name] have been decimated by the onslaught of the mutated creatures! The vile beasts are now roaming free across the entire colony, butchering our colonists with impunity. There are reports of survivors having fled the settlements to hide in the countryside, but it's only a matter of time before they are found by the marauding creatures.

 
Trigger conditions
  • Special Project Completed
Is triggered only by

Failing to defend the colony


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We must send military relief!

The Liberation of [colony name]

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Our expeditionary forces have liberated [colony name] from the mutated horrors that were occupying our main settlements. Their rotting corpses are now littering the ground, and our troops are currently in the process of bulldozing the putrid bio-mass into hastily dug landfills.

Pockets of survivors are emerging all across the [planet or moon], but many lives have been lost.

 
Trigger conditions
  • Mutants Overrun [colony name]
Is triggered only by

Liberating the overrun colony


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Time to rebuild.