A collapse measuring roughly four and a half metres long and two metres wide marks the roof of a souterrain, an underground passage or chamber typically constructed during the early medieval period in Ireland, often used for storage, refuge, or both. The subsidence is the only visible sign that something deliberate lies beneath the surface, the remains of a structure that was built to be concealed and has, in its own way, succeeded.

What makes this site quietly unusual is not one souterrain but two. A second example within the same ringfort, a circular earthwork enclosure of the kind built by farming communities from roughly the fifth to the twelfth centuries, was recorded on the Ordnance Survey six-inch map as early as 1944. Having a pair of souterrains within a single enclosure is uncommon and raises questions about the scale of activity once based here, though the available evidence does not answer them. The ringfort itself carries its own separate record, and the souterrains sit within its northwest quadrant, their relationship to the wider enclosure still legible in the landscape despite centuries of decay.