HighCom Facility Bravo-6
From Halopedia, the Halo wiki
Summary
The UNSC High Command has a base located located in Sydney, Australia. Below the HighCom Bravo-6 Facility is another massive facility called "The Hive". It is three-kilometers below the surface and reinforced with massive blast plating, anti-EMP armor, and three-kilometers of solid rock.
