It reveals a stone-built corbelled chamber, a type of underground passage constructed by carefully projecting successive courses of stone inward until they meet overhead, creating a rough vault without mortar. These underground structures, known as souterrains, were built throughout early medieval Ireland, most likely for storage, refuge, or both, and they are frequently found in association with ringforts, the circular enclosed settlements that once housed farming families across the Irish countryside.

The chamber retains a creephole at its southern end, a low connecting passage just large enough to squeeze through, of the kind that would have slowed any unwelcome intruder and given those inside a brief advantage. Collapse has occurred along the western side, which has left further exploration of the interior impossible. What remains visible is enough to confirm careful construction, even if the full extent of the souterrain can no longer be traced.