Installation 01

Installation 01 is one of the Seven Halo Rings. Very little is known about it but it appears to have a moon-like landscape.

In 2552, during the Battle of Installation 05, a signal was sent to this Halo from Installation 05, putting it on standby mode. A readout from Installation 05's Control Room showed that Installation 01 was fully prepared to fire on demand.

A more comprehensive readout was later observed on the Ark during the Battle of the Ark by the Arbiter, Master Chief and the Prophet of Truth. It once again displayed that Installation 01 was in standby mode, being prepared to receive the signal to fire. However, the Master Chief deactivated the installation before it could be fired.

Trivia

 * The surface looks very moon-like, similar to a barren desert.
 * No water surfaces can be seen or have not yet been detected.
 * The numbering of the rings concerning the IWHBYD ring sequence is the opposite to the the rings' actual installation numbers and should not be confused.
 * The surface resembles that of the surface of Mars (in fact, the surface is a picture of Mars' surface), though it has not yet been confirmed what kind of surface it is. More examinations will be needed to confirm the surface's components.
 * This ring is often mistaken for Installation 07 because of the ordering of the rings in the level "The Covenant".
 * It is possible that this ring is either furthest or closest to the Ark, with Installation 07 being the opposite, assuming the rings are numbered from their position relative to the Ark.