Installation 05

Delta Halo [known as Installation 05] is one of the Halo Installations built by the Forerunners to contain the Flood and is also one of the rings that The Covenant is searching for to control them and to complete the Great Journey.

When the High Prophet of Regret fled New Mombasa and used the silpspace rupture to self-destruct the City after Master Chief John-117 destroyed the Scarab, he set up a Base of Operations on Delta Halo I-05 to make the first attempt to activate it but Master Chief assassinates him.

Delta Halo I-05 has submerged structures and ruins and has little known wildlife too.

Delta Halo I-05 is the scene of many battles between the UNSC, the Covenant, the Forerunners, and the Flood in the race for the Sacred Icon/Index and its Library is the home to the Ruler of the Flood, Gravemind

When the High Prophets and the Brutes betrayed the Elites, the Brutes set up a Base of Operations in the Control Room building to activate this Halo Installation while the High Prophets'Forerunner flagship heads for Earth in search of the Ark. the uneasy UNSC-CS Alliance launches an offensive against the Brute encampment and the Arbiter kills Chieftain Tartarus in a duel for the Sacred Icon/Index in which it was retrieved and Delta Halo I-05 cannot fire, however it sends signals to other Halo Installations and they are ready for remote activation from the Ark.

The final days of the war had just begun.