That kind of knowledge tends to outlast the documentary record, passed on not because anyone wrote it down but because someone always seemed to know. Whether the passage is genuinely there, and what condition it might be in, remains unconfirmed by excavation.

The rath itself, a roughly circular enclosure of the kind built across Ireland during the early medieval period, typically as a defended farmstead, contains what may be a significant clue. A depression measuring roughly 1.6 metres east to west, 1.4 metres north to south, and around 0.8 metres deep, sits to the east of the enclosure's centre. That kind of hollow is often how a souterrain announces itself. Souterrains are dry-stone underground chambers or passages, usually associated with raths, and were likely used for food storage or as places of refuge. They are common enough across Ireland, yet each one represents a considerable feat of construction, carefully corbelled or lintel-roofed, sometimes running for many metres beneath the surface. In this case, the depression may mark a collapsed or partially collapsed entrance, the ground above simply giving way over time as the stonework below settles or deteriorates. For now, it is a hollow in a field, with local memory doing most of the interpretive work.