	A 1.6-kilometer service tunnel that runs beneath the central avenue along the spine of AUC's campus is a key element to making its overall pedestrian nature possible. Services accessible via the tunnel include all deliveries and pickups from campus buildings, fiber optic and technology-related wiring, major electrical conduits and plumbing for hot water, domestic water and chilled water for air conditioning. All other pipes for sewage, natural gas, irrigation and fire fighting are buried on the campus, outside the tunnel, around buildings as needed for their purposes.