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Historical Record
On 22 September 2552, Installation 04 is destroyed in one of the most consequential acts of the entire Human Covenant War. Only days earlier, the ring had been an astonishing discovery, an artificial world whose scale and engineering suggested the power of the long vanished Forerunners. By the twenty second, that wonder has collapsed into emergency. The Flood has been released from containment, Covenant and human forces have both been thrown into disarray, and the truth of Halo’s function has begun to emerge. What first appears to be a strategic prize is now understood as part of a far larger existential danger. The destruction of the ring becomes necessary not because it is politically useful or symbolically important, but because leaving it intact would risk catastrophe on a galactic scale.
The crisis accelerates when the Flood spreads through personnel and facilities across the installation. Captain Jacob Keyes is lost during this phase, and 343 Guilty Spark attempts to use human actors to activate Halo itself. Cortana uncovers the meaning of the installation and understands that the ring is not a refuge or a superweapon in the ordinary sense. It is part of a system designed to eliminate sentient life on a vast scale in order to starve the Flood of hosts. That revelation changes every surviving human objective at once. Master Chief can no longer focus only on rescue, resistance, or escape. The ring must be neutralised before either the Flood escapes the installation or Halo remains available for activation.
The final plan centres on the wreck of the Pillar of Autumn. With the ship destroyed as a warship but still carrying unstable engines and reactors, it offers one remaining way to shatter the installation. Master Chief fights through Covenant and Flood resistance to reach the Autumn, manually initiates the destruction sequence, and escapes with Cortana aboard a Longsword fighter. The timing is exact and desperate. As the Autumn detonates, the blast tears through Installation 04 and breaks the ring apart. Debris spreads through space while surviving Covenant forces are left scattered and the immediate Flood outbreak is contained with the destruction of its local environment.
The destruction of Installation 04 is a turning point for several reasons. It proves that Halo can be resisted, but it also confirms that the galaxy contains ancient systems more dangerous than the Covenant had yet revealed. The event leaves very few human survivors, deepens the mystery around the Forerunners, and changes the political and military stakes of every later campaign. It is also remembered as a moment of brutal necessity. A marvel of impossible engineering is destroyed because the alternative is worse. In Halo history, 22 September 2552 marks the end of the first ring crisis and the beginning of a broader understanding that the war is connected to forces older than either humanity or the Covenant empire.
Key details
Date: 22 September 2552
Location: Installation 04, Soell system
Source: Halo: Combat Evolved (2001)
Significance: The destruction of the ring contains the immediate Flood outbreak and prevents Halo from remaining an active threat.
Related events
FAQ
Q: When is Installation 04 destroyed in Halo?
Installation 04 is destroyed on 22 September 2552. The event takes place at the end of Halo: Combat Evolved.
Q: Who destroys Installation 04?
Master Chief and Cortana destroy the ring by using the wrecked Pillar of Autumn as an improvised bomb. They escape moments before the installation breaks apart.