That, in its own way, is what makes it worth knowing about. Somewhere beneath or near a levelled field in mid Cork, a souterrain, an underground stone-lined passage typically associated with early medieval ringforts and used variously for storage, refuge, or ventilation, lies buried or destroyed, with no visible trace remaining above ground.

The site sat within a ringfort, a circular enclosure of the early medieval period defined by earthen banks and ditches, and had been noted in print as far back as 1937, when a writer named Broker recorded it simply as an 'underground passage'. That sparse description is almost all the documentary record offers. Around 1976, according to local information gathered at the time, the ringfort was levelled, a process of agricultural land clearance that destroyed thousands of such monuments across Ireland during the mid-twentieth century. The souterrain went with it. By the time the site was formally recorded in the Archaeological Inventory of County Cork, there was nothing left to describe beyond its former existence and the manner of its loss.