A souterrain, to use the proper term, is an artificial underground structure, typically constructed during the early medieval period in Ireland, built from dry-stone walling and roofed with large flat slabs. They were dug into the earth beside or beneath ringforts and settlements, serving variously as storage spaces for perishables, places of refuge, or both. The simple fact of their construction, entirely without mortar and often precisely corbelled, has allowed many to survive more than a thousand years underground.

The Kildalton example sits in a parish whose name carries its own quiet antiquity. Kildalton, from the Irish meaning something close to the church of the foster-son or disciple, suggests an early ecclesiastical foundation in the area, the kind of settled, Christianised landscape in which souterrains were commonly built. Beyond the placename and the monument's recorded existence, the specific details of this particular passage, its dimensions, its state of preservation, its relationship to any surrounding earthworks, remain to be fully documented in the public record.