Installation 08

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This article is about the replacement megastructure. For other uses, see Installation 04 (disambiguation).
Installation 08
Halo 3 - Installation04B.jpg
General overview


Over the Ark

Operation overview


Halo Installation


Galactic sterilization/Flood containment and research

Attached AI(s):

343 Guilty Spark (de facto)

Date of construction:

Between September 2552 and December 2552

Date of destruction:

December 11, 2552;[1] destroyed due to premature firing

Structural information


10,000 kilometres (6,200 mi)[2]

Surface width:

318 kilometres (198 mi)[2]


.992G (approx)[2]

Surface temperature:

-23°C to 40°C (-9°F to 104°F) (controlled)[2]

Atmospheric composition:

1 (N2, O2)[2]


"A replacement. For the ring you destroyed."
Thel 'Vadam observing the second Installation 04's construction alongside John-117.[3]

Installation 08[4] was a partially completed Halo installation which was constructed at the Ark after the destruction of Installation 04.[5] Incomplete to the point where firing would result in its destruction, this replacement was destroyed by Spartan-II Master Chief John-117, only for yet another replacement to be constructed years later.


Installation 08 was designed as a very similar replacement to Installation 04, or Alpha Halo, in order to ensure that the Forerunners' Halo network was intact, and therefore able to encompass the entire Milky Way galaxy.



Installation 08's unfinished interior surface.

Following the Battle of Installation 04 and its subsequent destruction, Installation 00 was notified, and an automated function began building a new replacement for the missing installation's position. Though it has been eluded that the ring was partially constructed as part of a failsafe.[6] The main weapon was built first with the surrounding circular metal structure after by using materials that came from the strip mining moon located at the center of Installation 00.[citation needed]

Before it was released into space, the installation had a number of primary features available even though it was still not complete. These included the environment, atmosphere and main structures, and the main weapon, though the ring structure was not yet stable enough to survive this weapon's discharge.[5] This installation was intended to be a replica of Installation 04, as similarities can be noted with the design of the control room for this ring and that of its predecessor. Installation 08 was not a complete replica in every physical characteristic as it was noted that 343 Guilty Spark as custodian of the ring had made modifications and changes to the installation.[6]

At some point prior to the Battle of Installation 00, Cortana became aware of Installation 08's existence. While being held prisoner by the Gravemind on High Charity, she sent a covert message to John-117 on Earth informing him of a "solution to the Flood" that did not require activating the Halo Array.[7]


The still-incomplete installation was released into space just above the Ark. John-117 first discovered its existence shortly after he and Thel 'Vadam killed the Prophet of Truth. He decided that the only way to stop the local Flood infestation (which included the Gravemind from Installation 05) was to fire the incomplete Installation, which was out of range of the other rings.[3]

John headed to the Flood-controlled High Charity to retrieve Cortana, as she held the Activation Index from the first Installation 04. Aided in his escape by Thel, John found a crashed Pelican near the exterior of High Charity and piloted it to the incomplete ring.[8] The Pelican crashed in a snowy valley near the ring's Control Room, which was situated atop a high tower. As John and Thel made their way towards the tower, Flood dispersal pods descended from the sky to prevent them from activating the new Halo. The two, aided by Sergeant Major Avery Johnson, fended off the Flood and reunited with 343 Guilty Spark, who let them into the Control Room.

Inside the Control Room, Guilty Spark informed the trio that the installation would be completed in a few more days. However, with Flood reinforcements banging on the Control Room doors, Johnson declared they didn't have time and decided to activate the installation immediately. Guilty Spark, realizing that a premature activation would destroy the new ring, turned against the trio and fatally wounded Sergeant Johnson. The Chief used Johnson's M6 Spartan Laser to seemingly destroy the rampant Monitor. John then proceeded to activate the new Halo with the Index kept by Cortana.[5]


Main article: Raid on Installation 08

"When Halo fired, it shook itself to pieces. Did a number on the Ark"
— Cortana briefing John-117 of the aftermath of their escape.[5]
Installation 08 moments before activation
Installation 08 preparing to fire over the Ark.

As Spark predicted, the new installation was not ready to fire, and it began to shake itself apart and disintegrate. John and Thel escaped through the second phase pulse generator chamber and proceeded towards the Dawn in Johnson's Warthog as the shockwave of the activation caused explosive reactions all across the incomplete sections of the installation. John-117 and Thel 'Vadam barely managed to reach the Dawn before the Installation fired and subsequently exploded. Most of the Flood were destroyed in the explosion or perished from the ring's sterilization pulse, including the Gravemind, while the Ark itself suffered severe damage.[5]

By March 2555, a large chunk of the Halo was impaled on the Ark's central hub, like a dead, arcing tree climbing thousands of kilometers into space. There was also debris from the ring in space, some of it still raining down through the atmosphere and blooming into flame before crashing on the Ark's surface.[9] By May 2559, the Ark had been repaired and completed another replacement.[10]

The activation and firing of Installation 08 was extremely impractical and prone to many of faults, resulting in a few Flood spores or forms surviving on the Ark as late as June 2559,[11] and even a few Kig-Yar and Jiralhanae surviving inside the Anodyne Spirit.[12] This may have been due to the unfinished state of the ring, and/or because the ring was fired in the midst of its own destruction.[13] Another possibility may be the variable harmonics of the Halo's pulse.[14] The Banished were drawn into a fierce conflict against the Flood on the surface of the Ark after they had inadvertently released them from the rubble of High Charity, causing them to spread and multiply. After the Banished killed a Proto-Gravemind and reactivated the Ark's Sentinel defenses, the Sentinels and the Banished were able to contain the Flood and seal off High Charity once more.[11]

Replacement of a replacement[edit]

Main article: Installation 09

During the UNSC Spirit of Fire's battle with the Banished at the Ark in March 2559, Captain James Cutter, Professor Ellen Anders, and logistics AI Isabel formed a plan to deploy the second replacement for Alpha Halo, Installation 09, to the Soell system in an attempt to send a distress signal to human space.[10] On the way to the original site of Installation 04 however, a Forerunner Guardian construct controlled by Cortana's Created intercepted the ring.[15]


  • The multiplayer map Avalanche is located on Installation 08, but Installation 00 and the Milky Way galaxy are missing from the skybox.
  • The Halo Encyclopedia (2009 edition) identified Installation 08 (which had not been given an official designation at the time) as Installation 04B.[16] This naming convention has since been retconned by 343 Industries, with the rings' numeric designations being assigned sequentially in their order of construction.[4][17]


List of appearances[edit]


  1. ^ Halo Waypoint, Hero-Fortitude
  2. ^ a b c d e Halo: The Essential Visual Guide
  3. ^ a b Halo 3, campaign level The Covenant
  4. ^ a b Reddit: Return to the denomination. Installation 04 (B), (C). Canonically. 343 PLS "Sorry, 08 and 09 make way more sense :-) In actuality, they aren't meant to directly replace an individual ring, but to replace the loss in coverage that ring offered the galaxy." - Jeff Easterling
  5. ^ a b c d e Halo 3, campaign level Halo
  6. ^ a b YouTube - HALO, Halo Lore Stream: The Halo Array (Retrieved on Apr 6, 2018)
  7. ^ Halo 3, campaign mission Floodgate
  8. ^ Halo 3, campaign level Cortana
  9. ^ Halo: Hunters in the Dark, page 141
  10. ^ a b Halo Wars 2, campaign level Hold the Line
  11. ^ a b Halo Wars 2: Awakening the Nightmare
  12. ^ Sacrifice
  13. ^ Twitter - Jeff Easterling: "Guns that are blowing up while firing might not be quite as effective..."
  14. ^ Twitter - Jeff Easterling: "There is quite a bit we still don't know about the rings. Even Spark spoke of how variable the tuning could be."
  15. ^ Halo Wars 2, campaign level Last Stand
  16. ^ Halo Encyclopedia (2009 edition), page 176
  17. ^ Reddit: Return to the denomination. Installation 04 (B), (C). Canonically. 343 PLS "[...] No, I'm saying that the main reason you would build a replacement ring is to make sure you covered for the area that was suddenly now uncovered. The Alpha etc nomenclature itself denotes the firing order of each ring. The "Installation XX" number simply denotes which number that ring is in relation to the total number of rings manufactured - regardless of where they are positioned or in which order they would fire." - Jeff Easterling