Pionen is a former civil defence center built in the White Mountains

Vita Bergen

Vita Bergen is a park area of Södermalm in Stockholm....

 in Stockholm

Stockholm

Stockholm is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 851,155 in the municipality , 1.37 million in the urban area , and around 2.1 million in the metropolitan area...

, Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

 in the 1970s to protect essential government functions from nuclear strike. The address of the Pionen data center

Data center

A data center is a facility used to house computer systems and associated components, such as telecommunications and storage systems...

 is Renstiernas street 35 and 37.

It was converted into a data center

Data center

A data center is a facility used to house computer systems and associated components, such as telecommunications and storage systems...

 by the Swedish Internet service provider Bahnhof

Bahnhof

Bahnhof is a Swedish Internet service provider founded in 1994 by Oscar Swartz in Uppsala and was the first independent ISP in Sweden. Today the company is represented in Stockholm, Göteborg, Uppsala, Borlänge, and Lund....

. It opened on 11 September 2008 and Bahnhof continues to use the facility today. 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

Data center

A data center is a facility used to house computer systems and associated components, such as telecommunications and storage systems...

 is capable of withstanding a hydrogen bomb. The Pionen data center is also a colocation centre

Colocation centre

A colocation centre or colocation center , is a type of data centre where equipment space and bandwidth are available for rental to retail customers...

. In 2010 WikiLeaks

Wikileaks

WikiLeaks is an international self-described not-for-profit organisation that publishes submissions of private, secret, and classified media from anonymous news sources, news leaks, and whistleblowers. Its website, launched in 2006 under The Sunshine Press organisation, claimed a database of more...

 used Pionen's colocation services to store their servers.

Environment

Pionen is a data center

Data center

A data center is a facility used to house computer systems and associated components, such as telecommunications and storage systems...

 deep below 30 meters of granite

Granite

Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite usually has a medium- to coarse-grained texture. Occasionally some individual crystals are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic...

, 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

Data center

A data center is a facility used to house computer systems and associated components, such as telecommunications and storage systems...

has two backup power generators, which are actually submarine engines.