Редактирование: Half-Life universe (раздел)

=== Advanced Engineering ===

The Black Mesa Research facility depicts an organization capable of extremely advanced feats using roughly 1990s-era technology, and encompasses a hydroelectric dam, nuclear reactors, rocket engine testing facilities, massive terrariums for studying captured Xen specimens, and multiple advanced particle accelerator systems.  The complex is also shown to be capable of trans-orbital rocket launches and maintaining a satellite constellation.

Combine forces are based in and coordinated from "Citadels" - massive structures containing all the facilities they would need to manufacture, maintain, and support their forces locally, and establish portals for communication and transport with other Combine worlds.  Citadels are manufactured off-world and installed in-place through portals - displacing multiple city blocks at their base.