Data Center Knowledge
Summary
Underground facilities represent a small but growing niche in the global data center market, driven largely by adaptive reuse of retired mines and bunkers in North America and Northern Europe.
Swedish internet service provider Bahnhof has become one of Europe’s most visible advocates of underground data centers, using hardened facilities to combine energy efficiency, security, and resilience. Its best-known site, Pionen, is located nearly 100 feet beneath Stockholm in a former civil defense bunker originally built during the Cold War. The facility relies on thick granite walls for physical protection and stable temperatures, while district cooling and renewable energy help reduce operating costs and environmental impact.
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