This gun powder factory supplied the Swedish armed forces with so called Cordite during World War II. The plant consists of two separate sites, Tyfors 1 (overground) and Tyfors 2 (underground). The first stage of the manufacturing process took part inside the mountain and the Cordite was then refined at the overground site. During its active days the factory was highly secretive but is today a very well-known and popular Swedish 'splore. Parts of the lab and the archive has been saved while whatever else left behind is unfortunately often vandalised or has been stolen.