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 »

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 »

We are hiring – Project Manager! More info here.

Callio Extreme Run 2018 news and results here.

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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