A souterrain, to give it its proper name, is an artificially constructed underground chamber or series of tunnels, typically built during the early medieval period in Ireland. They were dug or built from stone, roofed with large lintels, and sealed beneath the earth, most likely serving as places of refuge, cold storage, or both. Thousands are recorded across Ireland, yet each one tends to sit quietly in its landscape, unmarked and easy to miss.

The Coolnaleen example is recorded as a known monument, though the details of its construction, its associated settlement, and the circumstances of its discovery remain held in archival material not yet widely available. Kerry has a particularly dense concentration of early medieval sites, a reflection of the county's active monastic and farming communities during the first millennium, and souterrains are a recurring feature of that landscape. Without more specific documentation in circulation, the Coolnaleen souterrain sits in a category familiar to anyone who studies Irish archaeology, acknowledged, mapped, and yet still waiting for closer attention.