A souterrain, to use the term of art, is a man-made underground structure, typically associated with early medieval settlement in Ireland, and thought to have served for cold storage, refuge, or both. This particular example was recorded as sitting within the eastern section of a cashel, a type of dry-stone ringfort enclosed by a circular wall, and positioned specifically between the cashel's two concentric enclosing walls. That detail alone is worth pausing on: the souterrain was built into the fabric of the fortification itself, tucked into the space between its inner and outer walls rather than placed openly within the interior.

The earliest recorded notice of it comes from Holt in 1912, with the more detailed observation made by McCaffrey in 1952, who placed it precisely in the haggard, the yard or enclosure beside a farmhouse used for storing hay and farm equipment. By that point the farmhouse was already the dominant feature of the landscape, and the ancient structure beneath it was legible only to those who knew to look. At some point between McCaffrey's note and the present, even that legibility disappeared. No visible surface trace of the souterrain survives today, which means the cashel it once belonged to has also left no obvious mark on the ground above it.