A souterrain, roughly speaking an artificial underground passage built from stone, sits below the surface here with no visible trace remaining above ground. These underground complexes, typically constructed during the early medieval period in Ireland, were built to serve as storage spaces, refuges, or escape routes associated with nearby settlements. The fact that this one has left no mark on the landscape at all gives it a particular kind of anonymity, the sort that makes the ground feel slightly less ordinary once you know.

The earliest recorded description of the site comes from Ryan in 1946, who noted a stone-lined passage accompanied by somewhere between six and seven chambers. That is a substantial underground complex by any measure; many souterrains consist of a single passage or one or two chambers, making a site of this reported scale relatively noteworthy. Beyond Ryan's account, the detail thins out considerably. There is no record of when the souterrain was constructed, no associated settlement identified in the notes, and no subsequent investigation appears to have added to what Ryan observed nearly eighty years ago. Whether the structure remains intact beneath the surface, or has partially collapsed in the intervening decades, is not known.