Photos: The Symantec bunker Summary: ZDNet UK has taken a trip inside Symantec's nuclear bunker to get a peek at how it fights the menace of cybercrime By Tom Espiner | November 25, 2005 -- 13:15 GMT (05:15 PST) Follow @tomespiner Previous | Next Image 3 of 8 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. Topic: Security Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.