A single roof slab, visible at the surface, is the only outward sign that anything lies below. The rest is inaccessible, sealed by time and soil, though local accounts suggest it was explored in the not-too-distant past.

The structure is a souterrain, an underground chamber or tunnel built from dry stone and covered with large flat slabs, a form of construction common across early medieval Ireland. Souterrains were typically associated with ringforts, the circular enclosed settlements that were the dominant homestead type in Ireland from roughly the fifth to the twelfth centuries. Their purpose is still debated, though cold storage, refuge, and concealment have all been proposed. This example sits within just such a ringfort, and the description that has come down through local knowledge is brief but telling: stone-lined walls, a slab roof, and a passage that someone, at some point within living memory, managed to enter. What they found, or how far they got, is not recorded.

What remains above ground amounts to very little, one exposed slab lying flat where the rest of the structure has become buried or collapsed. It is the kind of detail that is easy to walk past without a second thought, which is precisely what makes it worth pausing over.