Beside it, a large flat slab lies to the east, possibly a lintel, displaced at some point from its original position across the opening. That word "possibly" does a lot of work here. The stone may have been shifted by farming, by curiosity, or simply by centuries of gradual ground movement. Nobody recorded when it moved, or who noticed.

The opening is the visible trace of a souterrain, an underground stone-lined passage or chamber built during the early medieval period, typically between the seventh and twelfth centuries. Souterrains are found across Ireland, often in association with ringforts, the circular enclosed farmsteads that were the most common settlement type of that era. Their precise function is still debated; they may have served as cold storage for dairy produce, as places of refuge during raids, or both. This particular example sits within the ringfort recorded as CO119-076, a companion feature on the same parcel of land in west Cork. The two together, the enclosure above ground and the passage below it, represent a fairly typical pairing, though the survival of a visible entrance at ground level, with a potentially original lintel still nearby, makes this one worth noting.