Exploration #75. These big machines were the compressors in service to an old mine in the Charleroi region, Belgium. The building was part of the Le Puits Parent ot No.18, owned by the Monceau-Fontaine Company. This pit was more than 1000 m depth. Each extraction pit must have these kind of machines which supply compressed air to miners and machines underground. Everything in the mine underground depends on these machines so they had to be reliable and redundant. The mine closed in 1968 and the buildings were demolished in 1991. For some reason only this building has survived and it now overlooks the huge empty site.