Installation 00 (Earth-5875)

"Where would someone go to activate the other rings? ... Why, the Ark, of course."

- - Commander Miranda Keyes to 343 Guilty Spark

Installation 00, also known as the Ark is an ancient forerunner installation from where the Halo Array was constructed and can be activated in its entirety. It also serve as a safe haven from the genocidal activation of the Array's pulse. It is located outside of the Milky Way galaxy, at 218 (262,144) light years from the Galactic Center.