These structures, typically dry-stone lined and covered with large capstones, served a variety of purposes that archaeologists still debate: storage of perishables in a cool, stable environment, refuge during raids, or some combination of both. The presence of one at Listellick is a quiet reminder that this corner of Kerry was once a settled, organised place, its inhabitants capable of considerable engineering without leaving much above ground to show for it.

Souterrains are found in their hundreds across Ireland, and Kerry has a notable concentration of them, often associated with ringforts or early ecclesiastical sites. They tend to survive precisely because they are underground, overlooked by later agriculture and construction, their stone-lined interiors intact long after whatever structure once stood above them has vanished entirely. The Listellick example fits into this broader pattern of early medieval land use in the region, a period when the landscape was densely managed and every hollow in the earth had a purpose.