A slight hollow in the ground and a thread of oral tradition were enough to mark the spot, and when excavation finally confirmed their suspicions, it revealed a souterrain, an underground passage system of the kind built by early medieval Irish communities, most likely for storage or refuge. This one sits in the south-western quadrant of Lisnagun ringfort in Darrary, Co. Cork, tucked beneath the earthwork enclosure that would once have defined someone's farmstead and social standing.

The excavation, carried out across 1987 and 1988, uncovered three earth-cut chambers connected by creepways, the narrow low passages that force anyone moving between chambers to crouch or crawl. Each chamber is roughly 1.5 metres wide and about a metre high, just enough space to crouch in but not to stand. The ceilings are barrel-vaulted, meaning the earth above was shaped into a curved arch rather than left flat, a technique that distributes weight and helps prevent collapse. Two separate entrances were identified, along with an air vent, suggesting whoever built this was thinking carefully about ventilation and perhaps about having more than one way out. The fact that local tradition had quietly preserved the memory of the structure across however many centuries separated its construction from its excavation is, in its own way, as interesting as the archaeology itself.