- “What is that place?”
- “Where the Councilors were meant to watch the consecration of the Icon: the start of the Great Journey.”
Installation 05's Control Room was the site that controlled all of the Installation's operations. The Control Room is located on an island off the coast of a larger island in the middle of a large sea. Exact whereabouts are not known at this time.
Prompted by the Prophet of Truth, Tartarus brought 343 Guilty Spark and Lieutenant Commander Miranda Keyes to the control room in order to activate the ring, initiating the Great Journey. Before he could force Keyes to activate the panel, however, the Arbiter arrived, teaming up with Sergeant Major Johnson and other Sangheili troops.
After trying to convince Tartarus to change his mind, Tartarus instead forced the Index into the panel, activating the primary firing systems. A battle began between the Sangheili and the Jiralhanae, which ended after Tartarus and his troop's died and Keyes deactivated the ring. There is also a noticeable design difference from Installation 04's control room, in there being three rings, or levels, to it.