Global Chemicals Entry Security Barrier

A heavy steel-and-timber gate mounted on wheeled posts, its cross-bracing thick enough for a grown man to stand on. Under normal use it blocks vehicle access to the yard, but in crisis it rolls into a recessed track with an oiled groan, suddenly revealing a narrow lethal gap. The soldiers simply raise it when visitors arrive under questionable circumstances, and both Brigadier Lethbridge-Stewart and the Doctor exploit that exact moment—Bartlett drives the car right up, the guard barely has time to lower the barrier before the Brigadier is heaving the metal weight skyward. The wood grain shows scuffs from countless similar covert entries.