At Ballincraheen in County Kerry, a souterrain, an underground stone-lined passage of the kind built throughout early medieval Ireland, typically for storage or refuge, was recorded not through any physical evidence but through the memory of the person who owned the land. No trace of it was visible at ground level when surveyors visited.

The account comes from Toal's 1995 survey, which noted the landowner's recollection that a souterrain had originally existed in the south-west sector of the interior of a nearby enclosure. When the North Kerry Archaeological Survey examined the site, there was nothing to see. The souterrain had either collapsed inward, been deliberately filled, or simply been absorbed back into the field over time. What remains is a second-hand description of a feature that was already gone, embedded in a reference number and a brief note.

There is something quietly instructive about a site like this. The archaeological record of early medieval Ireland is full of souterrains, some still accessible, some long since fallen in, and a great many known only because someone remembered them. Ballincraheen belongs to that last category, a place where the evidence is not stone or soil but testimony, and where the gap between what was once there and what can now be found is the whole story.