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Pionen in 2006, before it became a computer center.

Pionen is a former civil defence center built in the White Mountains Södermalm borough of Stockholm, Sweden in the 1970s to protect essential government functions from nuclear strike. The address of the Pionen data center is Renstiernas gata 35 and 37.

It was converted into a data center by the Swedish Internet service provider Bahnhof. It opened on 11 September 2008 and Bahnhof continues to use the facility today.[1][2] Because of the facility being buried under the mountain, secured by a 40-centimeter thick door, and only reachable by an entrance tunnel, the data center is capable of withstanding a hydrogen bomb. The Pionen data center is also a colocation centre. In 2010 WikiLeaks used Pionen's colocation services to store their servers.[3]


Pionen is a data center deep below 30 meters of granite, with three physical datalinks into the mountain. Also, Pionen is located in Central Stockholm, with 1,100 square meters of space. Pionen features fountains, greenhouses, simulated daylight and a huge salt water fish tank. Its data center has two backup power generators, which are actually submarine engines.


  1. ^ Larsson, Linus (9 December 2008). "Serversafari 30 meter under jorden" (in Swedish). IDG Sweden. Retrieved 18 March 2011. 
  2. ^ Hammar, Ian (10 September 2008). "Bahnhof spränger Vita bergen" (in Swedish). realtid.se. Retrieved 18 March 2011. 
  3. ^ Hanlon, Michael (9 December 2010). "Just like out of a Bond film: Inside the astonishing subterranean WikiLeaks bunker". London: Associated Newspapers Ltd. Retrieved 14 June 2011. 

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Coordinates: 59°18′44.59″N 18°5′7.79″E / 59.3123861°N 18.0854972°E / 59.3123861; 18.0854972