Installation 01 (DID)

Installation 01, also known as Beta Halo, is one of seven ring-shaped superweapons that comprise the Halo Array. Originally located in the Orion Arm of the Milky Way galaxy, alongside the former Installation 04, it is now located above Installation 00. 
== History ==
=== Construction and early history ===
Installation 01 was built in the waning years of the Forerunner-Flood War. Like the other six installations that made up the Halo Array, Installation 01 was fired for the first time in 97,445 BCE as part of the Great Purification.
=== Forefather war ===
During the Forefather War, the S'southi armada discovered the existence of Installation 01 and made an attempt to occupy the ring, resulting in a six day battle in which the Galactic Alliance and the Installation's monitor, 001 Anguished Deliberation, allied with eachother against the S'southi, their common enemy. 
After a prolonged engagement over six days alongside several guerrilla skirmishes following the withdrawal of S'southi forces on the 17th of December, 2560, the Installation was occupied by Galactic Alliance military assets. 001 Anguished Deliberation and the Alliance formed a partnership to work together to defeat the S'southi, with the monitor providing assistance in the Alliance's search for the Great Archive.