It is a souterrain, an underground stone-built chamber or tunnel associated with early medieval settlement in Ireland, typically thought to have served as a place of refuge, cool storage, or both. What makes this one quietly compelling is its scale: the chamber runs to more than seven metres in length, oriented roughly north-northeast to south-southwest, and it survives in fair condition.

The souterrain sits within a ringfort, a type of enclosed farmstead that was the dominant settlement form in early medieval Ireland, usually dating to somewhere between the sixth and tenth centuries. Ringforts are common across the Irish landscape, though many have been ploughed out or built over; the fact that both the enclosure here and its underground feature have survived together gives the site an added coherence. The chamber is drystone-built, meaning its walls were constructed by laying stones without any binding mortar, relying entirely on the weight and fit of the material itself. Access at present is near the southern end of the structure.