A souterrain, one of those narrow stone-lined passages or chambers built beneath the earth in early medieval Ireland, typically used for storage or as a place of refuge, was recorded at this location and then, in practical terms, vanished. There is no visible trace remaining, only the cartographic fact of it.

The evidence is thin but specific. The 1935 Ordnance Survey six-inch map marks the word "Souterrain" at this spot, associating it with a small hachured earthwork, the kind of enclosure rendered on older maps through short radiating lines indicating a raised or embanked feature. That earthwork, recorded separately, hints at a settlement context, since souterrains in Ireland are most commonly found in association with ringforts or other enclosed farmsteads from roughly the sixth to the twelfth centuries. Whether the earthwork itself survives in any form, and what relationship it once had to the underground structure, is not something the surviving record can answer with confidence.