Photos: The Symantec bunker

The view out of the bunker towards the airlock, with door-locks on the left. The doors can be closed, and the air inside filtered in the event of the external atmosphere becoming toxic.

For our full feature on Symantec's bunker, click here.

Want to see one of the UK's other leading security firms at work? Click here to see our photos of the inside of Sophos' Pentagon.