When the ground collapsed, it opened onto a narrow lintelled entrance, the kind of low, deliberate threshold that announces a souterrain, an underground stone-built passage or chamber typically associated with early medieval settlement in Ireland, often used for storage or refuge.

What the collapse exposed was a single subrectangular chamber, modest in its dimensions: roughly two and a half metres long, one and a half metres wide, and less than a metre high. The long axis runs northeast to southwest. A single roughly-rectangular capstone spans the roof, supported at each corner by an upright stone, a simple but carefully arranged structure. The southern end is closed off with rough stone walling, while the side walls are simply earth-cut rather than built. Scattered stones and what may be additional lintel slabs around the area of collapse suggest that the chamber visible today is not the whole picture. There may be a further passage or chamber still underground, undisturbed and unexcavated, waiting beneath the field.

The site sits in pasture, and beyond the 1987 collapse there has been no excavation to clarify the full extent of the structure or its relationship to any surface settlement. What survives is a fragment, carefully built but incomplete in our understanding of it, a reminder that the Irish landscape still routinely surprises those who happen to step in the wrong place.