Installation 00

''The Ark redirects here. For the campaign level, see The Ark (level)''.

"Where would someone go to activate the other rings?"

- Lieutenant Commander Miranda Keyes

"...Why, the Ark, of course."

- 343 Guilty Spark

Installation 00, also known as The Ark, is a Forerunner installation from which all the entirety of the Halo Array can be activated simultaneously. Installation 00 also functions as a safe haven from the Halo network's strategic pulse, and as a facility to construct replacement Halos. The Ark is situated outside the galaxy, about 218 (262,144) light years from the galactic center. In comparison, Earth is 25,000 light years from the galactic center.

History
Like the rest of the Halo array, Installation 00 was likely created near the end of the Human-Forerunner wars circa 110,000 BCE. The Ark was designed to remotely activate every Halo ring from outside the array's blast radius. Installation 00 can be placed on standby mode via a fail-safe system that is only activated by an aborted firing such as the one that occurred at the end of the Battle of Installation 05. In addition to serving as the firing control center for the Halo array, Installation 00 functions as an automated factory to construct Halo installations, thereby ensuring that the Halo array is always ready to fire.

"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."

- --A message from the Librarian to the Didact

Knowing that the Array would defeat the Flood through sterilizing the galaxy of any neurologically complex life, the Forerunners planned to preserve all life by storing it in the Ark. In this final resort plan, known as the Library Project, the Librarian was to index every sentient species in the galaxy and bring specimens of each to the Ark. These last sentient species would be stored on the Ark and would later reseeded on their original homeworlds after the Halo array had been activated.

However, things did not go as planned. The Forerunner 05-032 Mendicant Bias, corrupted by the Gravemind, defected to the Flood and began fighting against his creators. Mendicant Bias knew of the Ark and how to access it through the Keyships, though he did not of its exact location. The Forerunners then constructed another military AI, Offensive Bias, in order to devise the best possible defense against Mendicant Bias and his fleet. The Librarian detonated all the Keyships under her command and spent her last days upon Mount Kilimanjaro, near the site of the slipspace portal to Installation 00 on Erde-Tyrene.

Battle of Installation 00
Immediately following the Prophet of Regret's botched invasion of Earth on October 20, 2552, the Prophet of Truth dispatched a Jiralhanae-led fleet to continue the assault and to uncover what he believed to be the Ark. By November 17, the Covenant had uncovered the structure they had spent the last month unearthing. Truth, though his Forerunner Dreadnought, activated the device, which was actually just a portal generating structure which led to Installation 00.

Truth led his fleet through the portal; after defeating a Flood invasion of the town of Voi, a joint United Nations Space Command - Covenant Separatist strike force followed the Prophet's forces. Upon their arrival, the later force were attacked by the Covenant, which held a 3:1 numerical advantage. Despite this, the Sangheili Fleet of Retribution crushed Truth's forces. After engaging the Covenant across the installation, SPARTAN John-117 and Arbiter Thel 'Vadam entered the citadel, where they found Truth, who had been infected by the Flood. Soon after 'Vadam killed the Prophet, effectively destroying the Covenant and ending the war, he, the SPARTAN, and 343 Guilty Spark, the former monitor of Installation 04, discovered that a replacement Installation 04 was being constructed by the Ark's foundry. The SPARTAN and the Arbiter soon rescued the AI Cortana, who held Installation 04's activation index, from the Flood-infested Covenant capital city, High Charity. They, with Sergeant Major Avery Johnson, assaulted the Halo's control room to activate the ring, destroying both the Flood and the remaining Covenant forces. They succeeded, though Johnson was killed by the monitor, who refused to allow another Halo to be destroyed. The ring's activation tore the partially constructed installation apart, destroying the Ark.

Design details


Installation 00 resembles a massive flattened dish with a series of eight curved arms, similar to the petals of a flower. Each arm posesses at least one petal station, from which Forerunner Lifeworkers operated.

At the core of the installation is the stripped remnant of a material-rich planetoid, asteroid, or other celestial body used for the construction of the Halos. The entire upper surface is terraformed, with oceans, forests and a large desert. Installation 00 appears to be between 90,000 to 100,000 kilometers (55,890 to 62,100 miles) in diameter. The Ark is the second-largest known Forerunner construct, only dwarfed by the the Micro Dyson Sphere encased in the artificial planet Onyx, which has a diameter of 300 million kilometers. Like the Shield Worlds, Installation 00 possesses an artificial sun.

Like the Halos, Installation 00 features a Cartographer facility, a map room that can pinpoint any location on the installation. Similarly to the Halos, the Ark features a control room from which the array can be activated. This citadel is protected by an system of energy shield barriers that circle the center of the disk. These barriers are controlled by towers that circumscribe the center of the installation.

The Ark's foundry, where the Halos are constructed, generates so much heat that the Ark requires multiple cooling stations. At least two such systems span a snowy gorge; it is possible that the massive cooling systems cause this icy climate.

Environment
The Ark has a habitable surface on each of its spokes and on the majority of the inner circle, apart from the foundry. This terrain was intended to support catalogued life forms prior to being reseeded throughout the galaxy. These landscapes and biomes are as diverse as those of Earth and of the Halos, consisting of deserts, taiga, and deciduous forests. Several bodies of water occur across the installation. As such, the Ark can sustain its own ecosystem, providing a variety of habitation for many kinds of life.

Like most Forerunner constructs, the Ark's atmosphere is similar to that of Earth, being mostly comprised of oxygen and nitrogen. This means that all known sentient species, with the exception of the Unggoy, can survive on the surface without any form of protection. As with the Halos, Installation 00 features a widely varying range of climates.

As the Ark is located outside the galaxy, isolated in a black void of space, there are no nearby natural sources of light to power the installation and facilitate the survival of biological organisms on its surface. To counter this problem, the Ark is equipped with an artificial structure consisting of a bright, sun-like light, with several metal arms jutting from its center. The light source "scans" over certain areas to generate day/night cycles, further contributing to the growth of vegetation and controlling weather patterns.

Slipspace portals
A major aspect of Installation 00 is its ability to send and receive objects via slipspace portals. During the Battle of the Capital, the Forerunners attempted to evacuate the seven Halos which remained under their control to Installation 00, though only one escaped. Later in the Forerunner-Flood War, the rebuilt Halo array was dispersed throughout the galaxy through the use of these portals. In order to ensure the safety of humanity, the Forerunners established a portal-generating structure near Mount Kilimanjaro on the human homeworld of Erde-Tyrene. During the Human-Covenant War on November 17, 2552, the Covenant forces under the command of the Prophet of Truth utilized this portal, sparking the Battle of Installation 00.

Trivia

 * The history and name of the Ark are a reference to the Biblical story of Noah, who was instructed by God to build an Ark to save specimens of every animal on Earth from a great flood. The name may also be a reference to Ark of the Covenant, which, according to the Biblical Old Testament and the Jewish Torah, contains the stone tablets of the ten commandments. It is the holiest object of the Jewish faith. The Ark of the Covenant is popularly believed to lie somewhere in East Africa, albeit in Ethiopia rather than Kenya.
 * The Ark has some similarity to the concept of an Alderson Disk. However, an Alderson disk is much larger and has a star in the center.
 * In Halo Legends: Origins, the Ark and Halos are depicted without land on their surfaces during the activation of the Halo array. This is likely an instance of artistic license.
 * The Ark was known as "Waypoint" during the production of Halo 3.

List of appearances

 * Halo 2
 * Halo 3
 * Halo: Cryptum
 * Halo Graphic Novel
 * Second Sunrise Over New Mombasa
 * Halo: Legends
 * Origins
 * ''Iris

Note
