Installation 05

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Installation 05, or Delta Halo as it is called by humans, is one of the seven massive Halo fortress worlds built by the Forerunner. It is also the second Ring that was discovered by the humans.

Details
Planet of Orbit: Substance

Monitor: 2401 Penitent Tangent

Status: What happened to Installation 05 after the events of Halo 3 is unknown. The heavy damage done to The Ark could have put the Halo out of standby, or it could be unaware of the Ark's status, and still be awaiting remote activation. Its buildings seem to be more 'ancient' looking than Installation 04. The aging of it could be due to the damage the Flood has done to it as well as the battles that take place, hinting that this is where the majority, or the most intense of the Forerunner/Flood battles took place. Some also believe that the relics found are not Forerunner, but Precursor, as the Forerunner favour metallic structures. It is also possible, that each Halo, while similar in architecture (i.e angular design, and same basic functional structures), has a different style from the next, an example being 05's Control Room having similarity to 04's Control Room in purpose, but with a new look, including a spherical shape at the centre of the building. This is different than both versions of Installation 04, which look almost exactly the same (being of the same style), and have the same surroundings. However, a combination of this and the weathering caused by battles with the Flood could be why Delta Halo's structures look so dissimilar.

The Installation may be smaller than Alpha Halo, described as being the size of a moon, rather than a planet, although the relevance of this is unknown. Whether this size difference is common among Halo installations, or whether Installation 05 represents a different Halo Installation model to Installation 04, is unknown, but it is likely that since Installation 04 was made specifically to study the Flood, its size would help slow the spread of Flood in case of emergency may be a reason.

Its terrain, with the exception of the Quarantine Zone, are mostly lakes and jungle.

History
It is assumed that Installation 05 was built around the same time as Installation 04, around 98,665 BC. It was activated shortly thereafter by the Forerunners, eradicating all sentient life in the galaxy and, presumably, destroying the Flood as well, with the exception of those specimens kept in the Halos for research. As of 2552, it had a record of 1.2 trillion simulated firings and one actual activation.

Flood Disaster
Hundreds or thousands of years prior to 2552, the Flood on Installation 05 escaped and evaded containment. It is possible that another alien race stumbled on the Installation and accidentally opened its Flood Containment Facilities. The Flood quickly grew out of control around the area of the Installation's Library. The Flood were kept contained by a Sentinel Wall built around the Library, but 2401 Penitent Tangent was captured. Without it, the Sentinels of the Halo lacked a controlling intelligence and so many of the structures around Installation 05 fell into horrible conditions, and most of the Installation came to look like a jungle strewn with ruins. It's possible that a central Flood Brain Form became so massive that it reached sentience and became a Gravemind residing on the installation.

At the time of the Human-Covenant War, a Gravemind was holding 2401 Penitent Tangent captive. Even with the addition of Forerunner Sentinel Majors and Enforcers, the Flood were able to remain loose, albeit contained within the Quarantine Zone by the Sentinel Wall. This stalemate is believed to be the cause of the slow decline into the horrible condition of the structures of the Installation. The Gravemind itself resided in the chamber directly below the Index Chamber in the centre of the Library. A battle record has been recently shown on Bungie.net:

REPORT: CONTAINMENT FAILURE

LF.Xx.3273 research and containment facility; [delta site] has experienced catastrophic specimen containment failure. All apertures into facility will be locked until further notice. Atmosphere evacuation and [reduction of ambient temperature] protocols have already been enacted. Request maintenance and security detail [at earliest opportunity]. [8 minutes] elapsed since initial containment failure.

REPORT: CONTAINMENT FAILURE

Waiting for maintenance and security detail. [32 minutes, 9 seconds] elapsed since request.

REPORT: CONTAINMENT FAILURE

Still waiting for maintenance and security detail. [24 hours] elapsed since request.

REPORT: SECURITY BREACH

LF.Xx.3273 research and containment facility; [delta site] has experienced a security breach via emergency [slip stream space] transportation conduits. Emergency [slip stream space] transportation conduits have been placed in recursive mode to contain unauthorized hostile lifeforms. Request emergency security detail. Still waiting for primary maintenance and security detail. [2512332 hours, 14 minutes, 6 seconds]elapsed since initial request.

REPORT: DERELICTION OF DUTY

2401 [PENITENT TANGENT] has been lax in the areas of maintenance and security.

LOG: QUERIED ADJACENT FACILITIES LF.Xx.3273 research and containment facility [alpha, beta, gamma, epsilon, zeta, and kappa sites] have all replied [systems normal] within expected constraints. This would tend to signify that the containment failure was purely mechanical in nature; perhaps a manufacturing flaw. As no [outside agent] has accessed [delta site] in the past [874068942 hours, 4 minutes, 46 seconds]—[allowing for a 61360 hour, 54, minute, 2 second margin of error]—sabotage would seem unlikely.

LOG: REQUEST UNANSWERED LF.Xx.3273 research and containment facility; [delta site] is currently being held at [.01 atm] / [184K]. Local maintenance and security hubs have failed to reply within expected constraints. [Bumping maintenance and security request up] to [quadrant oversight].

LOG: REQUEST UNANSWERED LF.Xx.3273 research and containment facility; [delta site] is currently being held at [1 atm] / [278K] as atmospheric seals were showing signs of stress. [Quadrant oversight] has failed to reply within expected constraints. [Bumping maintenance and security request all the way up] to 2401 [PENITENT TANGENT].

LOG: UNAUTHORIZED ACCESS TO FACILITIES LF.Xx.3273 research and containment facility; [delta site] emergency [slip stream space] transportation conduits have been accessed by unauthorized parties.

LOG: FILED COMPLAINT TO INSTALLATION 00 2401 [PENITENT TANGENT], monitor of Installation 05, has been lax in the areas of maintenance and security. Requests for aid in said areas have gone unanswered by both 2401 and [subservient] systems well beyond expected constraints.

Discovery
In 2552, the High Prophet of Regret, a Covenant Hierarch, discovered the location of Installation 05 during The First Battle of Earth. He made a Slipspace jump from Earth to the Halo, followed closely by Miranda Keyes' ship UNSC In Amber Clad.



When they arrived Master Chief tracked down and killed the prophet Regret, just as the Covenant city of High Charity arrived with hundreds of thousands of ships. The Covenant landed on the Installation and foolishly deactivated the Sentinel Wall. Flood were able to infect much of the Human and Covenant forces, even taking control of the In Amber Clad and High Charity. The Covenant Arbiter retrieved the Index, believing it to be necessary to begin the Great Journey, but he was almost killed by the Brute Tartarus. He fell into the chamber of the Gravemind, where he met the Master Chief, 2401 Penitent Tangent, a Prophet Form of Regret and the Gravemind. There they "edified" him of the true nature of the Installation. Meanwhile, Tartarus brought the Index to the Halo's Control Room. Starting The Battle of Delta Halo. He activated the station, but was killed by Johnson and The Arbiter before it could fire. The Index was removed from the chamber, but the installation had a fail-safe protocol which activated and sent a signal to the other Halos, putting them on standby mode, ready for remote activation through The Ark. When Installation 05 was last seen, Flood were running loose as well as in High Charity and the surrounding Fleet. The Flood appear to be in control of the Installation, as the Civil War of the Covenant has caused fighting between the remaining Covenant forces on the ring. The extent of the Flood control in Delta Halo after Halo 3 is unknown, since they were never eradicated. With the Gravemind killed at the end of Halo 3, it is most likely that the Flood reverted to their original feral and disorganized state and would be easily controlled by the Sentinels and Covenant forces present there although it is not for sure due to the unknown fate of 2401 Penitent Tangent. The UNSC AI Cortana had suggested that the Installation be destroyed via the use of a NOVA Bomb, but it is unknown if the idea was ever followed. There is confusion surrounding the Halo Installations in a holographic representation on the Citadel of Installation 00 believed to be showing Installation 05 with a blood red and cracked surface (whereas this is more likely the volcanic surface of Installation 03). It is possible that the Covenant Separatist Quarantine Fleet situated above Delta Halo have glassed the entire Installation, although had this been their intention, they would have more likely completely destroyed the ring much like Installation 04.

Astronomy
See full article: The Halos

The "Ringworld" of Halo is much smaller than Larry Niven's Ringworld, by a magnitude of 3,000. While the diameter of Niven's ringworld is close to the diameter of Earth's orbital of 300,000,000 km, the 10,000 km diameter of Halo is much closer to the diameter of Earth itself, which is 12,756 km. The Ringworld has a star similar to our sun in its centre, and Halo is orbiting a planet, but does not encircle it.

Trivia

 * This is the only known ring that has 2 Monitors. 2401 Penitent Tangent and the Cold Storage Monitor.
 * The first monitor to get corrupted by the flood was 2401.