Underwater Lair

The Underwater Lair serves as one of the major locations in Season 15 and was home to the Blues and Reds after they relocated from Desert Gulch. It served as their base for a number of years whilst Temple planned his revenge against the UNSC.

Overview
The base was located underwater somewhere beneath the surface of the planet Armada 8. The base itself contained a number of rooms including an office, workshop, trophy room, recreational areas, meeting room, hanger and various others.

The base was large enough to house both the Blues and Reds and the Reds and Blues along with various other Simulation Troopers from Project Freelancer.

Role in Plot
After finding out about the collapse of Project Freelancer, The Blues and Reds abandoned their previous base and moved to the underwater lair.

Several years later, the Blues and Reds lured the Reds and Blues to Armada 8 and took them to their base. After bringing agents Washington and Carolina to the lair, Temple trapped them in his trophy room. Upon revealing his true intentions to the Reds and Blues, Temple locked them away in brig. After being rescued, the Reds and Blues along with Locus escaped through the hanger.

Trivia

 * The lair is represented by the Halo 5 map Fathom.
 * Several areas are made in Forge.