The Swedish datacentre with a bunker mentality

The servers are in four caves radiating from the centre of the bunker. This is the view from the meeting room (which has a map of the moon on the floor).

"The hosting centre is built for co-location," Karlung said. "Clients rent rack space and place their own servers in our centre. There is room for about 8,000 servers."

Is the environment good for servers? "It was a happy surprise," France-Lanord said. "We expected humidity, but it's really, really dry in there, and the temperature is very stable."

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