Installation 01

Installation 01 is one of the seven Halo installations. The ring's landscape is comprised of a large desert with a limited atmosphere; this may have been by design, due to a lack of proper maintenance or some other incident after the original firing of the Halo Array. It is the farthest Halo from Installation 00.

Activation
During the Battle of Installation 05 on November 3, 2552, 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.

Deactivation
During the Battle of Installation 00 later the same year, Installation 01 was still in standby mode and was prepared to receive the signal to fire. However, SPARTAN John-117 deactivated the installation, as well as the rest of the array, before it could be fired.

Trivia
Its surface bears a exact resemblance to a portion of Mars's surface.