The souterrain at Ballymacprior, on the Iveragh Peninsula in County Kerry, does not even manage that. It exists now mainly as a rumour, a structure locally reputed to have occupied a rath, before being quarried away entirely.

A souterrain is an underground passage or chamber built from stone, typically associated with early medieval settlement in Ireland. They appear beneath raths, the circular earthen enclosures that served as farmsteads, and are thought to have functioned as places of refuge, cool storage, or both. At Ballymacprior, the rath itself survived long enough for local memory to record that a souterrain once ran beneath it, but the stone was taken, and with it any chance of excavation or further understanding. Quarrying of this kind was not unusual in rural Ireland, where dressed or conveniently shaped stone was simply too useful to leave underground when a wall needed building or a farmyard needed surfacing. The result here is an absence where there might have been evidence, a gap in the record that local knowledge, at least, tries to fill.