A military structure designated HKB 20/979 located near the area of Aalo in southern Norway (coordinates 58.0508°N, 7.7037°E). The specific purpose, historical context, and current condition of this site are not confirmed by the provided search results. The search results discuss Norway's known nuclear research facilities at Halden and Kjeller, and a waste repository at Himdalen, none of which correspond to this location or designation.
No direct historical or technical information linking 'HKB 20/979 Aalo' to a specific function, era, or event is available in the provided data.