Callio is a project to oversee the reuse of the Pyhäsalmi Mine, located in the town of Pyhäjärvi in Finland.

Callio aims to make Pyhäsalmi Mine an operating environment for businesses and an underground research facility.

The "main level" of the mine is at 1400 meters depth, and is equipped with service and social facilities, e.g., a restaurant and the deepest sauna in the world.

Adding to the challenge was the environmental conditions, as the run was constant uphill, the temperature over 23 °C and humidity varying between levels of 50%-100%.

The men's professional series was won by Tino Tiilikainen, a member of the Vuokatti SkiTeam, beating the previous record held by Sami Jauhojärvi, with a time of 1:05:56.

3 new world records were set in the farmerswalk, conan wheel, and deadlift categories by Aivars Smaukstelis, Antti Mourujärvi and Dainis Zageris.

[25][26] Callio was also facilitating the use of Pyhäsalmi Mine as a filming location for the new sci-fi television series White Wall, with a cast led by Aksel Hennie, Vera Vitali and Eero Milonoff.

It is a Finnish-Swedish collaboration between Yle and SVT that was premiered in 2020 and is the most expensive Finnish television series made, with a 900 000 euro budget per episode.

The film is produced by Markku Hakala and is set in the 1970s and is described as a mystical story about a woman, a man and a giant trapped in a barn.

Callio Lab is a multidisciplinary R&D environment aiming to utilize better the unique infrastructure and facilities of the Pyhäsalmi Mine.

Callio Lab is a member of the BSUIN network, which consists of underground laboratories and facilities in the Baltic region.

[32][33][34][35][36] LAGUNA is a proposed very large volume underground neutrino observatory, designed to study e.g., the excess of matter over antimatter in the universe.

Pyhäsalmi mine would have been at the optimal distance from the CERN particle accelerators, which would have provided the neutrino beams for the experiment.

Due to the location of the farm, heating expenses are eliminated because the geothermal energy keeps the temperature at a constant 25 degrees.

[10][38] Plant Production in Mine was a project and study conducted by the Natural Resources Institute of Finland (LUKE)[1] in Callio Lab laboratories at 660 meters underground.

If optimal growing conditions can be characterized, this would broach the possibility of year-round production of hops with hundreds of harvests instead of just one.

At the same time experience is gained from whether a mine heading toward closure could be transformed into a state of the art training center.

The program provides lectures as well as hands on learning opportunities and can be tailored to suit the participants previous experience.

The project aims to ascertain what technologies and applications could be applied in this field of study both from a scientific and economic point of view.

The Pyhäsalmi mine will be the site of Finland's first underground fire-, rescue- and safety training center.

The main coordinator is the city of Pyhäjärvi with numerous professional partners and businesses, that specialize in fire extinction and safety systems, ICT solutions, and tunnel- and shaft rescue operations.

The purpose of this co-operation is to design and develop on a smaller scale a pilot facility which can later be implemented in a full-scale version.

[61][62][63][64] In 2012, explosives contaminated with pyrite ore were sent from the Pyhäsalmi mine for destruction at the Forcit ammunition factory in Vihtavuori, where (after a year in storage) the container started to heat up and smoke.