Look through it and you are looking into a souterrain, an underground stone-built passage or chamber of early medieval origin, typically constructed for storage, refuge, or both. This one is circular, roughly 2.1 metres in diameter, with a creepway, a low connecting passage just wide enough to crawl through, running off to the west.

The ringfort it sits within is itself a familiar feature of the Irish countryside, a circular enclosure defined by earthen banks or stone walls and associated broadly with early medieval settlement. Souterrains are often found within such enclosures, tucked beneath or beside the domestic structures of the period. This particular chamber was explored, according to local memory, sometime in the early 1940s, though no formal excavation report appears to have followed. What was found, or by whom, is not recorded. The detail that survives comes from local information passed on by Eileen McSweeney, which gives the site a quietly personal quality; its history preserved not in official documents but in the kind of knowledge that moves between neighbours.

The chamber is visible, at least partially, through the opening at the surface, so there is something to see without any excavation required. The creepway to the west suggests the possibility of further extent beyond what is currently viewable, though the full layout of the souterrain has not been documented in detail. It sits quietly inside the ringfort, a structure within a structure, both of them largely left to the field.