While the landowner was digging near a quarry, the bucket struck a capstone, exposing the roof of a souterrain that had been quietly intact beneath the surface for centuries. A souterrain is an underground stone-built passage or chamber, typically associated with early medieval settlement in Ireland, used variously for storage, refuge, or ventilation of a dwelling above ground.

The passage entrance lies roughly eighteen metres south-southwest of the quarry edge, and the souterrain runs toward that edge until it meets it. Its construction is drystone, meaning the walls are built without mortar, with flat lintels laid across the top to form a roof. By the account left on record, it is rather low inside, suggesting a tight, deliberately confined space of the kind that characterises many examples of the type across Munster. The accidental exposure of the capstone during quarrying work is a reminder of how much of the early medieval landscape remains embedded just below agricultural and industrial ground, undisturbed until a machine catches an edge of stone at the wrong angle.

The site sits close enough to the quarry that any further extraction in that area would pose an obvious risk to what remains. The souterrain appears to survive largely as it was built, and the exposed capstone section near the quarry edge is likely the most visible indicator of its presence at ground level.