Going underground at the Wikileaks assumption centre

Inside the former nuclear bunker where Wikileaks keeps its servers

To enter the old nuclear bunker in Stockholm where the Wikileaks secrets are stored is like passing into another surreal world, half way between planet Earth and cyberspace.

The entrance on the street is non-descript. It is just a door in a face of rock. Steam billows from pipes alongside into the bitterly cold Swedish air.
If you press the bell and get invited in, glass doors open and you walk into a James Bond world of soft lighting. There is the high security of doors which only open when the door behind you has closed, and which need special passes for every few steps of the journey into the inner cavern.
But there is also falling water in fountains and pot plants, because people work here, watching monitors from a control room. One of the carpets has the surface of the moon on it to give an added surreal effect.
And then there are the computer servers in a cave, with bare rock walls underneath the wooden houses of Stockholm. In the inner cavern are rows and rows of computer storage cases.
And on one of them are the files of Wikileaks, only a fraction of which have so far been made public to the immense embarrassment of politicians who once said something indiscreet to an American diplomat, never dreaming the words would bite back in public.

A James Bond world of soft lighting

The data centre is owned by a company called Bahnhof, and its founder, Jon Karlung, gave the BBC a tour. Mr Karlung took over the remnant from the Cold War in 2007 and had to dynamite out a further 4,000 cubic metres of rock to make it big enough.
It is ultra-secure and needs submarine turbines - just inside the entrance - to generate enough power to maintain a moderate temperature even in the vicious Swedish winter.