What they were marking, however, remains genuinely unresolved. Today, all that is visible on the ground is a small circular depression, roughly four metres across, filled with stone. It is not much to look at, but the uncertainty surrounding it is what gives it a quiet strangeness.

The site sits approximately 120 metres to the north-east of Eyrecourt House. Whether the hollow represents a natural cave formation or the collapsed remains of a souterrain is unknown. A souterrain, for those unfamiliar with the term, is an underground passage or chamber typically associated with early medieval settlement in Ireland, often used for storage or refuge, and usually constructed from dry-laid stone. The fact that another possible souterrain lies around 75 metres to the south-west hints at something more than coincidence, though it proves nothing in itself. The 1838 map label suggests the feature was locally known and recognisable at that point, but whether it was already partially collapsed, or still accessible in some form, is not recorded. Archaeological investigation has not been able to settle the question either way.