The ground above it shows nothing: no depression, no tell-tale hollow, no scatter of disturbed stone. What keeps the site on record at all is local tradition, the kind of place-memory that tends to prove more durable, and more accurate, than it is sometimes given credit for.

Souterrains are underground stone-built passages or chambers, typically associated with early medieval settlement in Ireland, dating roughly from the seventh to the twelfth century. They were most likely used for storage, refuge, or both, and they appear across the country in considerable numbers, often connected to ringforts. At Cappeen, no such surface structure has been identified alongside the supposed underground feature. The tradition alone marks the spot. Whether that tradition reflects a genuine archaeological reality, a collapsed or fully silted passage invisible from above, or something that has simply faded beyond recovery, remains an open question.