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The bunker entrance
Symantec's U.K. operations center is in a bunker built by the British government in the early 1990s to shelter key utilities workers in the event of a nuclear attack. The entrance is set into a hill near Winchester, England.
The airlock door is monitored round the clock by a digital camera. Closed circuit TV cameras give a 360-degree view of the outside of the bunker and have 30 days of digitally recorded back-up.