Installation 04: Difference between revisions

|anchor=Threshold/[[Basis]]<ref name="VIS"/>

*[[Flood]] containment and research<ref name="halo array"/>

|constructed=[[97,445 BCE]]<ref name="halo array"/>

|diameter={{Convert|10000|km|mi|sp=us|sigfig=4}}<ref name="VIS"/>

|surface width={{Convert|318|km|mi|sp=us|sigfig=3}}<ref name="VIS"/>

|gravity=0.992 G (approx)<ref name="VIS"/>

|surface temperature=-23°C to 40°C (-9°F to 104°F) (controlled)<ref name="VIS"/>

|atmosphere=1 ([[Wikipedia:Nitrogen|N₂]], [[Oxygen|O₂]])<ref name="VIS"/>

'''Installation 04''', also known as '''Alpha Halo''', or simply '''Halo''',<ref>'''[[Halo: Combat Evolved]]''', campaign level, ''[[Truth and Reconciliation (level)|Truth and Reconciliation]]'' - Captain Keyes: "''They call it, Halo''"</ref> was one of seven ring-shaped superweapons that comprised the [[Forerunner]]s' [[Halo Array]]. It was located in the [[Soell system]] in the [[Orion Arm]] and was the closest Halo ring to the [[human sphere]].<ref name="warfleet"/>

The [[Forerunner]]s had Installation 04 constructed by the [[Foundry (location)|Foundry]] of [[Installation 00]]<ref name="p371">'''[[Halo: Primordium]]''', ''page 371''</ref> approximately around the same time as the rest of the [[Halo Array]], circa [[97,445 BCE]] during the [[Forerunner-Flood war]].<ref name="halo array"/><ref>[https://www.halowaypoint.com/en-us/community/blog-posts/canon-fodder-array-with-words '''Halo Waypoint''': ''Canon Fodder - Array With Words'']</ref> The array was designed by the Forerunner [[Builder]]s to combat the parasitic [[Flood]] by eradicating them and all [[Sentience|sentient]] life in the [[Milky Way]]. After the rings were built, Installation 04 and its fellow Halos were distributed from Installation 00 to positions across the galaxy through [[slipstream space]] [[Slipspace portal|portals]].<ref name="halo array"/><ref>'''[[Halo Legends]]''', ''[[Origins]]''</ref>

Around [[40,000 BCE]], an [[unidentified alien vessel]] crash landed in [[Sector 1215]]. Sometime prior to the crash the ship started broadcasting a distress signal.<ref name="terminal5">'''Halo: Combat Evolved Anniversary''' - ''[[Terminal (Halo: Combat Evolved Anniversary)#Terminal 5|Terminal 5]]''</ref><ref name="time">'''Halo: Combat Evolved Anniversary''' - ''[[Terminal (Halo: Combat Evolved Anniversary)#Terminal 6|Terminal 6]]'' (343 Guilty Spark: ''"I have now endured 60,000 years without word from outside the Array."'')</ref> After attempting to translate it, [[343 Guilty Spark]] blocked the signal, as no communication revealing the location of any of the Halos was allowed.<ref name="terminal5"/> After no lifeforms exited for several days, Spark had a large sarcophagus constructed around the vessel.<ref name="time"/>

Installation 04's destruction left behind a large field of debris, with a few large chunks of the ring remaining.<ref>'''[[Halo 2]]''', campaign level ''[[The Heretic]]''</ref> Some smaller pieces of Installation 04 have landed on Basis, while others have burned up in Threshold's atmosphere upon entry.<ref>'''[[Halo 2]]''', multiplayer map ''[[Burial Mounds]]''</ref> [[Alpha Shard|One damaged fragment]] notably made a slipspace jump as a safety measure, and ended up in a distant system.<ref name="wp shard"/>

The UNSC's [[Treaty of 2552|peace treaty]] with the [[Swords of Sanghelios]] forbids either party from landing on the remains of Installation 04.<ref name="nf1"/> There is a 500-[[Wikipedia:Light-second|light-second]] exclusion zone surrounding the former site of the ring. In [[2556]], [[Spartan-IV]] [[Fireteam Apollo]] was [[Operation: SHELL GAME|deployed to the exclusion zone]] in direct violation of the treaty; there they recovered some items of value, including a "black box" from the Covenant cruiser ''[[Undiminished Entelechy]]''.<ref name="lc">'''[[Halo Legendary Crate]]''', ''[[Halo Legendary Crate/Data Drops|Data Drop 3]]''</ref>