That uncertainty is itself the point. A souterrain, typically a stone-lined underground passage built during the early medieval period and used variously for storage, refuge, or escape, usually leaves at least some mark on the landscape above it. Here, there is nothing to see. No hollow in the ground, no collapsed lintel, no depression where the roof might have given way. The passage, if it exists, has been entirely swallowed by the earth.

The only trace of it appears in a 1937 reference by Broker, who noted a passage within the ringfort said to run toward Abha Mhor, the Irish name for the Awbeg River, which flows through this part of north Cork. That phrase, "said to go," carries a lot of weight. It is the language of local tradition, the kind of claim passed down through townlands rather than recorded in documents, often containing a kernel of something real but stretched across generations into something harder to verify. Souterrains connected to rivers, or thought to extend improbable distances underground, turn up in folklore across Ireland; the practical underground passage and the legendary tunnel have a tendency to merge over time. Whether the Ahane example was ever surveyed, or whether Broker was himself relying on oral report, is not recorded.