A souterrain, to use the technical term, is an artificial underground structure, typically built during the early medieval period in Ireland, consisting of one or more chambers or tunnels constructed from dry-stone walling and roofed with large capstones. They are found widely across Ireland, though their precise function is still debated; current thinking suggests they served as cool-storage cellars, places of refuge, or both. The example at Loona Beg is recorded as a monument, though the details of its construction, dimensions, and condition remain unpublished at present.