No depression in the soil, no exposed stonework, no obvious hint that anything lies below. The place exists, for now, almost entirely as rumour and memory.

A souterrain is an underground stone-lined passage or chamber, typically associated with early medieval settlement in Ireland, often used for storage or refuge. They are frequently found in association with raths, the circular earthen enclosures that served as farmsteads across the Irish countryside from roughly the sixth to the twelfth centuries. The rath at Breaghwy is a recorded monument in its own right, and the souterrain attributed to it survives, if it survives at all, only in the knowledge passed down locally. No excavation appears to have confirmed its presence, and nothing at ground level points to where it might be found.