Beneath the interior of an earthen rath, the circular enclosure type built across Ireland from the early medieval period onwards, local knowledge preserves the memory of a souterrain: an underground passage or chamber, typically stone-lined, used for storage or refuge. The entrance hole once lay outside the rath's southern bank, but it was filled in at some point in the past, and today there is no visible trace of it whatsoever. The site exists, in a sense, as a piece of inherited information rather than anything a visitor could observe.

Souterrains are relatively common finds within raths across Ireland, constructed to take advantage of the stable, cool conditions underground. What is unusual here is not the combination itself, but the degree to which this particular example has been absorbed back into the landscape. The rath remains as a recorded earthwork, catalogued alongside its companion feature. The souterrain, though, survives only in local memory, its entrance deliberately closed and its interior inaccessible. No excavation appears to have been carried out, and the precise form of the underground structure, its length, construction, or number of chambers, remains unknown.