It is the kind of detail that catches the eye precisely because it raises more questions than it answers. No structure stands there now, and whatever the cartographers recorded has long since vanished, filled in or collapsed, leaving behind only a label and a location.

The annotation has led some researchers to suggest the site may once have been a souterrain, an underground passage or chamber typically constructed during the early medieval period, often used for storage or refuge and usually found in close association with a nearby settlement. That association is where the Busty Hill site becomes genuinely puzzling. As Healy (1974), O'Sullivan (1986), and Clinton (1998) each noted, the location is strikingly exposed, and sits at an altitude where one would not ordinarily expect to find evidence of human habitation. The absence of any surrounding settlement evidence has led all three scholars to lean towards a different explanation: that the cavity was not man-made at all, but a natural feature, perhaps a solution cave or fissure in the rock, which was simply recorded by OS surveyors as a notable curiosity in the landscape.

Busty Hill itself offers little in the way of physical remains to examine today. The cave site, whatever its origin, appears to have been filled in at some point, and no visible trace remains on the surface. For anyone interested in the cartographic history of the area, the 1843 OS six-inch map is the most rewarding source, and digitised versions are freely accessible through the Irish Historic Maps viewer. The hill's exposed position means the surrounding landscape reads clearly from elevation, which makes it easier to appreciate just how unlikely a spot this would have been for an early medieval household to dig underground, and why the natural explanation has seemed, to those who looked closely, the more persuasive one.