It is a souterrain, a type of structure built during the early medieval period, typically between the seventh and twelfth centuries, consisting of one or more chambers and connecting tunnels constructed from dry-stone walling and covered with large capstones. Their precise purpose has long been debated; they may have served as cool storage for dairy produce, as places of refuge, or both, and they are found in considerable numbers across Ireland, though their distribution in Connacht remains less thoroughly documented than in some other provinces.

Beyond its classification and location, the specific history of this particular souterrain remains difficult to recover. No detail about its dimensions, its condition, the manner of its discovery, or any associated finds has yet been made available through public channels. What is known is that it has been recorded as a monument, placing it within a wider landscape of early medieval activity in the region. Mayo contains numerous sites of this period, many of them still embedded in agricultural land, visible only as subtle depressions or crop marks, their presence known more to local farmers than to casual passers-by.