At Lackaroe in County Kerry, there is a rath, an enclosed circular earthwork of the early medieval period typically used as a farmstead or place of refuge, and within it, somewhere beneath the southern half, local tradition holds that an underground chamber once existed. Whether it survives intact below ground, collapsed entirely, or was never quite what people believed it to be, nobody can currently say with confidence. There are no visible remains.

The possible structure in question would be a souterrain, a type of underground passage or chamber built from stone, common across early medieval Ireland and often associated with raths. They are thought to have served as storage spaces, places of refuge, or both, their cool, dark interiors well suited to keeping food, and their narrow entrances awkward for anyone trying to force their way in. The one at Lackaroe enters the record not through excavation or physical survey but through local information, a phrase that carries its own quiet weight. Someone knew, or remembered, or had been told, that something lay beneath the ground inside the rath. The formal record dutifully notes it as a possibility and then, equally dutifully, notes there is nothing left to see.