thumb|right|300px|Pionen in 2006, before it became a data center.
thumb|right|300px|Pionen in 2006, before it became a data center.
Pionen is a former civil defence center built in the White Mountains Södermalm borough of Stockholm, Sweden in 1943 to protect essential government functions. The address of the Pionen data center is Renstiernas gata 35 and 37.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).