During ground-levelling work ahead of the shed's construction, a roof lintel was removed, opening a gap measuring roughly 1.4 metres long and 0.4 metres wide. Too narrow to enter, it was nonetheless wide enough to peer into, and what it revealed was a souterrain, one of those dry-stone-lined underground passages or chambers built throughout early medieval Ireland, most likely for food storage or as places of refuge in times of threat.

The visual inspection suggested the passage ran approximately five metres eastward from the gap before turning sharply northward. The side walls, constructed using drystone technique, meaning stones laid without mortar, were visible beneath the surviving roof lintels. The site sits in rough pastureland, the kind of ground that tends to preserve what lies beneath simply because it has never been intensively cultivated or built upon. What adds a particular weight to this small patch of land is that it had already yielded something significant: when the existing house nearby was constructed in the late 1970s, evidence of a children's burial ground came to light. Known in Irish tradition as a cillín, such burial grounds were typically used for unbaptised infants and others excluded from consecrated ground, and they are found across the country, often in marginal or liminal spots. That two features of this kind should occupy the same field, one underground passage and one informal burial ground, speaks to a landscape with a long and layered history of use, most of it unrecorded.