As requested by Mr Evil here a few pics from the old DFAT Communications Centre which was located under the southern carpark of the old Admin Building.
The first two are of the foyer and the third of the hallway. The centre was basically a square shape with the hallway running around it. The outside of the hall was office space, rec room etc. The inner core was composed of computer room and comms centre.
The ceiling in the open areas was made up of these funny metal plates as mentioned elsewhere. Purely decorative, but they rattled like buggery during the Newcastle earthquake.
Supposedly the foyer was a standing wave tube, so no electromagnetic radiation could penetrate or escape even though it was open ended. The second photo shows the narrow door at the top which could be closed to seal the centre.
Last two photos show some sections of the graffiti wall.