Page last updated at 09:50 GMT, Thursday, 1 April 2010 10:50 UK

Inside an underground data bunker

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Originally built in the 1950s as a nuclear bunker, Iron Mountain's 'The Underground' high-security facility in Pennsylvania, USA, is now home to one of the safest data centres in the world.

2,700 people, many of them government officials, work in the facility under a limestone mountain - which holds everything from classified documents to old movie reels and valuable photograph collections.

But there has also been significant expansion in one area of the business: the storage and backup of online data in massive servers, or 'cloud storage'.

Ramon Goni tours the tunnels of The Underground with its vice-president Charles Doughty.

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