A souterrain is a man-made tunnel or chamber, typically built during the early medieval period and associated with ringforts, the circular enclosed farmsteads that dot the Irish countryside. They served variously as storage spaces, places of refuge, or both. This one is known only because someone wrote it down over a century ago, and nothing on the surface remains to confirm it.

The sole record comes from a 1914 publication by Neary, which notes simply that the ringfort at this location "contains a souterrain". That single line is all that connects the site to its underground feature. The ringfort itself is catalogued and known, but of the souterrain, no visible surface trace survives. It may be intact below ground, collapsed, or so thoroughly obscured by centuries of agricultural activity that it has become, for practical purposes, lost. Neary's observation exists as a data point without a physical counterpart, a gap in the archaeological record that has never been closed.