They have not collapsed dramatically or been excavated and reburied; they have simply vanished from the surface, leaving the ground above them as unremarkable as any other patch of Irish farmland. That invisibility is precisely what makes them interesting.

A souterrain is an artificial underground tunnel or chamber, typically stone-lined, built during the early medieval period and associated with ringforts, the circular enclosed settlements that once numbered in the tens of thousands across Ireland. They served variously as refuges, storage spaces, or escape routes. The two at Ahane were recorded in 1934 by a researcher named Bowman, who noted two depressions in the interior of the ringfort, each roughly eighteen feet long, four feet wide, and two feet deep. His conclusion was straightforward: these were the collapsed remains of souterrain roofs, the ground having subsided where the covering stones or timbers had given way. At that point, at least, the outlines were still legible as slight hollows in the earth. Today, no visible surface trace remains at all.