At Dromin in County Kerry, a rath, the type of circular earthen enclosure built as a farmstead during the early medieval period, was noted to contain what local people called a 'cave'. That description almost certainly refers to a souterrain, an underground passage or chamber, typically stone-lined, that was built beneath or alongside raths across Ireland. They were used variously for storage, refuge, and ventilation of dairy produce, and they turn up in their hundreds in the Irish archaeological record. This one, however, is known only by its absence.

The record of it traces back to the 1940s, when the Irish Folklore Commission ran a nationwide schools project in which pupils collected local knowledge from their communities. It was through this Schools Manuscript collection that the 'cave' on John Moriarty's farm at Dromin came to be noted at all. The rath itself survives in the record, but the souterrain, if it was ever structurally intact enough to be entered or observed, has left no visible trace above ground. Whether it collapsed, was filled in, or was simply never substantial enough to leave surface evidence is unknown.