The Pyhäsalmi Mine, located in the town of Pyhäjärvi, Finland, is one of the deepest known mines in Europe reaching 1,445 metres underground. As mining will end, a globally unique multidisciplinary operating environment, Callio, will emerge. The mine and the surrounding brownfield area offer a diverse range of opportunities for success for new and innovative projects and established operators seeking new horizons alike. Will your business be one of the first to seize the opportunity?

Latest news »

There are some beautiful things taking shape in the town of Pyhäjärvi, Finland. Located in the one of the deepest known places in Europe, in the depth of Pyhäsalmi mine, an operation environment Callio offers one of fewest underground research facilities in the whole world. Please read more here.

Callio Press Release 21 Jun 2018: Pyhäsalmi Mine gets a new zoning plan and a new life as “Callio Pyhäjärvi”. Read more.

Why our food is coming from below our streets in the near future? There is a world of opportunity below our feet that can help us. Read more about the Han Admiraal’s post in LinkedIn here.

Callio Extreme Run 2018 – world’s toughest underground running race is here.

Pyhäjärvi Energy Storage in Mine event in Helsinki 5.4.2018.

Underground Laboratories as platforms for innovation and new businesses – International research group meeting in Pyhäjärvi, Finland. Baltic Sea Underground Innovation Network (BSUIN) project has received substantial EU-funding.

Latest publications »

What type of bioenergy terminal concept would be a profitable part of Callio? Read more.

Callio Pyhäjärvi underground agriculture mentioned in the new publication to give inspiration and encouragement to cities and decision makers on the possibilities of Underground Space Use. Author Ilkka Vähäaho, City of Helsinki. Read more.

Callio Pyhäjärvi Energy Storage in mine event – 5.4.2018 Helsinki – presentations.

Callio Press Release 27 Feb 2018: The world’s highest hydraulic head in the underground energy storage plant – Pyhäjärvi, Finland.

New Callio Pyhäjärvi Data Center Campus video launched.

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