This is a souterrain, a type of man-made underground structure commonly associated with early medieval settlement in Ireland, typically used for storage, refuge, or both. What makes this one quietly remarkable is not just its survival but the manner of its construction: rather than being cut entirely from scratch, it was built within a natural gryke, one of the deep fissures that fracture the limestone surface of karst landscapes, with the bedrock itself forming the walls.

The passage runs just over twelve metres in length, oriented broadly north to south, and extends from the south-western edge of an associated hut site. It sits within a semi-karst plateau of rough pasture that also contains an extensive multiperiod field system, suggesting this corner of Clare was worked and occupied across several distinct phases of human activity. The souterrain measures roughly 1.4 to 1.5 metres wide and reaches a depth of around 1.2 metres at its best-preserved section near the centre. The southern end has collapsed to a depth of just 0.4 metres and is choked with rubble, while the northern end, though also partly fallen, remains somewhat more accessible, with a minimum depth of 0.8 metres. The decision to exploit an existing gryke rather than quarry an entirely new channel speaks to a practical ingenuity, working with the grain of the landscape rather than against it.