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The airlock door is monitored by a digital camera 24/7. CCTV cameras give a 360 degree view of the outside of the bunker, and have 30 days of digitally recorded back-up.
Blast doors lead into the bunker. They were designed to minimise the shock waves caused by a nuclear explosion. The air inside the bunker is pressurised to 1.5 ppsi greater than the external air pressure, the stop unfiltered air entering the bunker.
The glassed-off room that is the Security Operations Centre. Workstations are constantly manned by up to 15 analysts. Threats are also monitored on the four flatscreens on the facing wall.