Editing Installation 08

{{Era|HCW}}
{{Disambig header|the replacement megastructure|other uses|Installation 04 (disambiguation)}}
{{Megastructure infobox
|image=[[File:Halo 3 - Installation04B.jpg|300px]]
|description=
|location=Over the [[Installation 00|Ark]]
|anchor=
|type=[[Halo Array|Halo Installation]]
|function=Galactic sterilization/Flood containment and research
|caretaker=[[343 Guilty Spark]] (''de facto'')
|constructed=Between [[2552|September 2552]] and [[2552#December|December 2552]]
|destroyed=[[2552#December|December 11, 2552]]<ref name="Fortitude">[http://halo.xbox.com/en-us/intel/featured/video/herofortitude/bfe5038b-314a-4f17-a6be-f7613e0e3788 '''Halo Waypoint''', ''Hero-Fortitude'']</ref>; destroyed due to premature firing
|diameter={{Convert|10000|km|mi}}<ref name="VIS">'''[[Halo: The Essential Visual Guide]]'''</ref>
|surface width={{Convert|318|km|mi}}<ref name="VIS"/>
|gravity=.992G (approx)<ref name="VIS"/>
|surface temperature=-23°C to 40°C (-9°F to 104°F) (controlled)<ref name="VIS"/>
|atmosphere=1 ([[Wikipedia:Nitrogen|N<sub>2</sub>]], [[Oxygen|O<sub>2</sub>]])<ref name="VIS"/>
}}
{{Quote|A replacement. For the ring you destroyed.|[[Thel 'Vadam]] observing the second Installation 04's construction alongside [[John-117]].<ref name="TC">'''Halo 3''', campaign level ''[[The Covenant (level)|The Covenant]]''</ref>}}

'''Installation 04B'''<ref>'''[[Halo Encyclopedia]]''', ''page 176''</ref> was a partially completed [[Halo Array|Halo installation]] which was under construction at the [[Installation 00|Ark]] since the destruction of the original [[Installation 04]].<ref name="Halo">'''[[Halo 3]]''', [[campaign]] level ''[[Halo (Halo 3 level)|Halo]]''</ref>

==Background==
This Installation was designed as a very similar replacement to the original [[Installation 04]] in order to ensure that the [[Forerunner]]s' Halo network was intact, and therefore able to encompass the entire [[Milky Way]] galaxy.

==History==
===Construction===
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. The main weapon was built first with the surrounding circular metal structure after it using materials that came from the [[strip mining moon]] located at the center of Installation 00.

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. The new installation was also not networked to the other installations, allowing a tactical pulse to be fired without triggering the other six installations. It is never revealed if this is an option available to completed installations as well, although it is likely that Installation 04B merely had not been set up with this network yet, as it was incomplete; a logical precaution considering the effects of a misfire.

At some point prior to the Battle of Installation 00, Cortana became aware of Installation 04B'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.<ref name="Floodgate">'''Halo 3''', campaign mission ''[[Floodgate]]''</ref>

===Discovery===
The new installation was released into space just above the Ark, but it was still incomplete then. 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.<ref name="TC"/>

John-117 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.<ref name="C">'''Halo 3''', campaign level ''[[Cortana (level)|Cortana]]''</ref> 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 pod]]s 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-117 then proceeded to activate the new Halo with the Index kept by Cortana.<ref name="Halo"/>

===Destruction===
{{Main|Raid on Installation 04B}}
{{Quote|When Halo fired, it shook itself to pieces. Did a number on the Ark|Cortana briefing John-117 of the aftermath of their escape.<ref name="Halo"/>}}
As Spark predicted, the new installation was not ready to fire, and it began to shake itself apart and disintegrate. John-117 and Thel 'Vadam escaped through the second [[phase pulse generator]] chamber and proceed towards the ''Dawn'' using Johnson's Warthog. The shockwave of the activation began to tear the installation apart, causing explosive reactions all across 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, while the Ark itself suffered severe damage.<ref name="Halo"/>

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.<ref>'''Halo: Hunters in the Dark''', ''page 141''</ref> By May [[2559]], the Ark had completed another [[Installation 04C|replacement]].<ref name="HW2">'''[[Halo Wars 2]]''', campaign level ''[[From the Deep]]''</ref>

Despite the ring's activation, a number of Flood forms survived on the Ark as late as October 2559.<ref name="HW2 AtK">'''[[Halo Wars 2]]''', Awakening The Nightmare''</ref> This may have been due to the variable harmonics of the Halo's pulse<ref>[https://mobile.twitter.com/GrimBrotherOne/status/766840297498157056 '''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."'']</ref> and/or because the ring was fired in the midst of its own destruction.<ref>[https://twitter.com/GrimBrotherOne/status/874380206785445888 '''Twitter - Jeff Easterling:''' ''"Guns that are blowing up while firing might not be quite as effective..."'']</ref> The [[Banished]] were drawn into a fierce conflict against the Flood on the surface of the Ark.<ref name="HW2 AtK"/>

===Replacement===
{{Main|Installation 04C}}
During the {{UNSCShip|Spirit of Fire}}'s [[Battle of Installation 00 (2559)|battle]] with the [[Banished]] at the Ark in [[2559#March|March 2559]], Captain [[James Cutter]], Professor [[Ellen Anders]], and logistics AI [[Isabel]] formed a plan to deploy the second replacement for Alpha Halo, Installation 04C, to the Soell system in an attempt to send a [[distress beacon|distress signal]] to [[Human colonies|human space]].<ref>'''[[Halo Wars 2]]''', campaign level ''[[Hold the Line]]''</ref> On the way to the original site of Installation 04 however, a Forerunner [[Guardian|Guardian construct]] controlled by Cortana's [[Created]] intercepted the ring.<ref>'''Halo Wars 2''', campaign level ''[[Last Stand]]''</ref>

==Trivia==
The multiplayer map ''[[Avalanche]]'' is located on Installation 04B, but Installation 00 and the Milky Way galaxy are missing from the skybox.

==Gallery==
<gallery>
File:H3 - Halo fly through.jpg|Concept art of Installation 04B's interior for ''[[Halo 3]]''.
File:H3 - Halo reveal.jpg|Concept art of Installation 04B's reveal.
File:H3 - Halo matte.jpg|Closeup of the Halo.
File:H3 - To the Halo.jpg|Concept art of the Halo over the Ark.
File:Ih_Halo_ziggurat_02.jpg|Early concept art of the control room, with the Ark in the background.
File:Ih_Halo_ziggurat_01.jpg|Finalized concept art of the structure, now bearing clear similarities to the original ring's control room.
File:Installation_04b_wall.jpg|Concept art of the Installation's incomplete environment.
File:H3 - Warthog run concept art.jpg|Concept art for the Warthog run at the end of ''Halo 3''.
04B Citadel hologram.jpg|A hologram showing the status of Installation 04B before its destruction.
File:Int4.jpg|The Forerunner symbol that represents Installation 04B.
File:Ark02.jpg|The incomplete Installation 04B rises from the Ark's center.
File:HighCharityView.jpg|The partially constructed Installation 04B visible from the Ark's Citadel.
File:HaloOverArk.jpg|Installation 04B in the skies of the Ark.
File:Installation 4 2 Construct.jpg|The scaffolding on the new Halo.
File:04B Control Room.png|Installation 04B's Control Room.
File:Halo ring 1.png|The surface of Installation 04B.
File:37121689-Medium.jpg|The Master Chief and the Arbiter driving at full speed in Johnson's Warthog to reach the ''Dawn'' before the new Halo is destroyed.
File:HM-John&friends.png|Thel 'Vadam, John-117, 343 Guilty Spark, and Avery Johnson on Installation 04B in ''[[Halo Mythos]]''.
</gallery>
{{Linkbox|gallery=yes|gallerypage=Images of Installation 04}}
{{Clear}}

==List of appearances==
*''[[Halo 3]]'' {{1st}}
*''[[Halo Legends]]''
**''[[Origins]]''
*''[[Halo: Hunters in the Dark]]''
*''[[Halo Mythos]]''

==Sources==
<references/>

{{Forerunner|array|category=no}}

[[Category:Halo Array]]