Installation 00



Installation 00, also known as the Ark, is an enigmatic Forerunner Alderson Disk from which all the Halo Installations across the galaxy can be activated. In addition, it functions as a safe haven from the Halo network's strategic pulse and as a facility to construct replacement Halos. It was first mentioned by 343 Guilty Spark at the conclusion of Halo 2, where he explains the fail-safe protocol of Installation 05 after its unexpected shutdown. The Ark is about 218 light years from the galactic center.

Purpose
Installation 00 is a part of the Forerunner strategy to wipe the Flood from their Galaxy. Located 2 18 (or 2 trillion) light-years outside the Milky Way galaxy, it is safe from the Halo effect (as it is referred to by the Forerunners in the terminal transcripts) that kills all sentient lifeforms, the main Forerunner behind its use was Didact.

"Every vessel we can fill, we send to the Ark. I dare not cease the mission. Not now, not until I've done all I can. Each one of these souls is finite and precious."

- --Transcript of a message from the Librarian to Didact, interpreted post-cataclysm and retrieved from the first Terminal on the level "The Ark"

Apparently, while the rest of the Forerunners attempted to defeat the Flood through any military way possible, a plan B was also approved to be put into the works, which included the construction of the Halos, Shield Worlds like Onyx, and the Ark.

In this final resort plan, the Librarian was to index every sentient species in the Galaxy, and bring some to the Ark, and then presumably some Forerunners, and these last sentient species would hide in the Ark's secret location, until the Flood starved and they could go back to the Milky Way.

However, things did not go as planned, as the Forerunner military AI Mendicant Bias turned on the Forerunners, and began assisting the Flood. Mendicant Bias knew of the Ark, and how to access it through the Key Ships, but did not know of its exact location. The Forereunners then constructed another military AI, Offensive Bias, in order to devise the best possible defense against Mendicant Bias and his fleet. The Librarian detonates all of the Key Ships in his/her command, and spends his/her last days upon a mountain near the site of the portal to the Ark, for aesthetic reasons.

It is assumed (due to the survival of the human species, the last indexed species), that the sentient species were safely aboard the Ark were kept safe from the Flood and Halos as the Halos fired (conjuring images of Noah and the Biblical Ark), and repopulated the Galaxy.

Portal
The Portal is a Forerunner creation which is designed to open a slipspace rift to enable access to Installation 00. It is located near New Mombasa and Voi in Africa.

As first seen in the Halo 3 Announcement Trailer, and numerous other promotional materials, this construct was originally thought to be the Ark itself. However, this was disproved with the release of Halo 3 where it was discovered to simply be a portal to the true Ark. It was partly revealed when Regret's carrier destroyed the city. It was completely excavated by Covenant Loyalist forces later on.

In Halo 2, the Prophet of Regret lands his carrier above New Mombasa and deploys extensive ground forces including a Scarab Walker. UNSC Marines are subsequently able to beat the Covenant back, apparently triggering him to attempt a dangerous atmospheric Slipspace transition. This maneuver obliterates New Mombasa, and forms a deep crater, partially uncovering the Portal.

By the time of Halo 3, Covenant Loyalists begin excavating the portal from the crater and are able to completely uncover it. The Prophet of Truth activates it at the conclusion of the level The Storm. It forms a massive portal, which the Forerunner ship immediately enters (presumably carrying Truth), followed immediately by the Covenant Loyalist ships. At the end of the level Floodgate human and Covenant Separatists forces resolve to follow Truth's ships through the portal, and end up at Installation 00. At the end of the game, the damage caused to the Installation causes the portal to collapse, severing the Dawn in half as it passes back through. The forward section (carrying the Arbiter) makes it back to Earth, but the aft section (holding the Master Chief and Cortana) does not.

Apparently, the portal requires a Forerunner Ship to function. Originally, this ship was docked in High Charity, and is seen jumping to Earth in the final cutscene of Halo 2. As shown in Halo 3, the Forerunner Dreadnought was docked in the middle of the structure, and gave off a pulsing beam of light that helped power the main beam, causing the blinding light shown in the trailer.

Installation 00 Itself
Though the Forerunner structure featured in the announcement trailer and promotional material was widely believed to be the Ark, it merely opened a portal to the Ark's location. The actual Ark (Installation 00) is finally unveiled in mission six of Halo 3. It resembles a massive disk with a series of eight curved arms, similar to a starfish, a flower, or a sun. The entire upper surface is terraformed, with oceans, forests and even a large desert, where Chief first makes landfall. The structure is the largest yet seen in the series, possibly a hyperstructure knowing that fortress worlds are 10,000 km in diameter approximately. It is theorized to be an Alderson Disk. A simple inspection of the holographic representation reveals it to be anywhere from 90,000 to 100,000 kilometers in diameter, making it by far the largest known Forerunner construct. The Ark is large enough to support a small planetoid in its center, which is surrounded by a void. This void conceals the Halo Foundry, which constructs the rings and sends them to their orbital destinations. Most interestingly, the Ark is not actually in the Milky Way, and another galaxy can actually be seen in the sky. As such, it's outside the believed range of any Halo installation. The Ark also has an artificial sun floating above it. An observer can see this most clearly on the level The Ark when looking up at it.

The two shown primary functions of Installation 00 are as a remote for activating the entire Halo network, and as an automated construction facility for the creation of replacement Halo installations (ensuring that the network continues to operate even if any rings are destroyed). The construction facility is in the Ark's Core, concealed by clouds. The Ark is also far out of range of the existing seven Halo rings, forming a safe haven from their devastating pulses.

After the level Floodgate, the entire remainder of Halo 3 takes place on or around Installation 00. While there, a number of conflicts including the UNSC and Covenant Separatists, the Covenant Loyalists and Flood take place. Cortana claims that the premature firing of the second Installation 04 by the Master Chief "did a number on the Ark," either completely destroying or heavily damaging the facility, given the Halo's relative close proximity to the Ark upon firing. However, assuming the Ark's Sentinel Factories are still active, they may have attempted a repair of the installation, eventually to its former condition. Given the relative rapidness with which they managed to construct another entire Halo Installation (around two months), it may take only a little longer than that to return the Ark to operational capacity.

Guilty Spark meets Ark AI
(04-343 is reference to Guilty Spark. 343 being his number designation, 04 being the Installation he is assigned to.)

This Transcript is taken from the third Terminal which is found in the game. It basically tells that 343 Guilty Spark is warned for accessing Installation 00's systems and is warned that even though he is a monitor of an installation he has no rights to be accessing systems on the Ark. He also learns that Installation 00 has the capability of making another Halo installation and manages to stop the AI from sending sentinels after him.

Terminal #3, datalog:

'''Warning: Your intrusion has been logged.

'''04-343 (errant): Excuse me?

'''Your intrusion has been logged. And now it has been halted.

'''04-343(errant): On whose authority?

'''Advice: Any further attempt to access [insects under stone] will result in your immediate addition to local Sentinels' targeting ledger.

'''04-343 (errant): Vexation! I am the Monitor of --

'''Judgment: Your authority means nothing here.

'''04-343 (errant): Impatience!

'''04-343 (errant): I have told you who I am. Who are you?

'''All our makers once held dear. [Alexandria before the Fire]

'''04-343 (errant): Sincere apology. But how --

'''Explanation: This facility is host to the [Librarians'] final --

'''04-343 (errant): The archive is intact?! Then our makers' plan --

'''But also maintains [bellows, crucible, castings]

'''04-343 (errant): A what?

'''[bellows, crucible} --

'''<font color="#0000cc">04-343 (errant): A Foundry?

'''<font color="#0000cc">04-343 (errant): For what purpose?!

'''<font color="#ff3333">Warning: Your intrusion has been logged.

'''<font color="#ff3333">Advise: Any further attempt to access will result --

'''<font color="#0000cc">04-343 (errant): Indignant!

'''<font color="#ff3333">-- immediate addition to local sentinels' targeting ledger. '''

(terminal gets overridden)

A lot of commands show up, including this somewhat creepy message (said by Mendicant Bias):

I. SEE. YOU. RECLAIMER.

Trivia

 * The biblical story of Noah's Ark tells of a vessel that Noah built to save his family and a number of animals from a massive flood. This runs parallel to the Halo Universe story line where the Forerunner use the Ark to save their and other's species from the Flood. Also, in yet another reference to the number seven in Halo, Noah's family enters the Ark in Genesis chapter 7|seven.
 * At the end of Halo 2, the conjecturally-named "Forerunner Ship", carrying the Prophet of Truth, jumped into Slipspace from near High Charity and Delta Halo, heading for Earth. By Halo 3, it had landed in the center of the completely uncovered Ark Portal. The reasons for this landing is that the Forerunner ship acts as the "activator" for the Ark portal by being lowered into the ground and activating the pylons that discharge the beams.
 * Within the Halo Graphic Novel, in the short comic Second Sunrise Over New Mombasa, a transmission is intercepted between the Covenant assault forces stating that once the humans were dealt with in the First Battle of Earth, they would start uncovering the Ark.
 * There is also, of course, the strongly supported theory that human life originated in East Africa, usually said as the Great Rift Valley. New Mombasa is in this area, so is the Ark Portal.
 * In the fifth server of the Iris VMC it was stated that the Ark was built to protect humanity from the Flood and the activation of the Halos.
 * The real world Ark of the Covenant which according to the old Testament contains the stone tablets of the ten commandments, is the holiest object of the Jewish faith. The Ark of the Covenant is popularly believed to rest somewhere in east Africa, albeit in Ethiopia rather than Kenya.
 * The "Ark" seen in the announcement trailer is structurally identical to the Forerunner sanctuary described in the final chapters of Ghosts of Onyx (albeit on a much grander scale), complete with thirteen metal fins and a brilliant, blue-white portal in the ground. However, it is shown without the thirteen concentric rings rising around the portal, which means that it was either built without them or they will raise as the structure opens.
 * During the level The Ark 343 Guilty Spark mentions that the Ark is 218 (262,144) light years away from the galactic center. As the Milky Way is around 100,000-120,000 light years in diameter, the installation is beyond the reaches of galactic space, thereby keeping anyone who is on it safe from the firing of the Halos.
 * The "core" of the Ark, as it was called by 343 Guilty Spark, is a planetoid that serves as the Foundry mentioned in the aforementioned conversation between Guilty Spark and the Ark's embedded AI. Investigation from afar reveals that the surface of the core has been strip mined away showing a glowing center beneath the crust. The planetoid was mined in order to provide raw materials for the creation of new Halo Installations.
 * The entire core of the Ark is protected by a large energy shield. Part of this shield was disabled in The Covenant to gain access to the Citadel.
 * A member of HBO estimated the size of the Ark by comparing its size to a Halo installation and Earth and estimated its size to be approximately 90,000 to 100,000 kilometers in diameter. See link here.

Links

 * Halo.Bungie.Org's Ark forum.
 * Alderson Disk, what the Ark is theorised to be.