It appears to (quickly) manufacture its underground and transport them to the surface, via a movable ramp. It is capable of building and reinforcing the UNSC's powerful ground based Corps with Wolverines, Cobras, and Scorpion Tanks. Vehicles are stored as prepackaged "kits," and quickly assembled via the structure's internal assembly equipment and personnel, before being released for use in combat. The Covenant equivalent is the Factory. It costs 150 resources and requires a tech level of 2.