Two stone slabs, sitting flush within the enclosure, are said to cover the entrance to a souterrain, the kind of subterranean complex that early medieval communities in Ireland constructed beneath or beside their ringforts. A souterrain typically consists of a series of low, corbelled or lintelled passages connecting one or more chambers, probably used for cold storage, refuge, or both.

The Irish Folklore Commission's Schools' Collection, a remarkable archive of local knowledge gathered by schoolchildren in the late 1930s, noted the slabs and the tradition attached to them. A scholar named Graves, writing in 1930, offered a description of the site, characterising it as consisting of the usual underground passages leading into chambers, a phrase that suggests the structure conforms to the well-documented souterrain type found widely across Munster and beyond. The site sits within a rath, a roughly circular earthen enclosure that was the standard farmstead form in early medieval Ireland, and the pairing of rath and souterrain is common enough to be almost expected in Kerry's archaeological record. What is less common is having the entrance slabs visible at surface level, lending the site a slightly uncanny quality, as though the ground itself is keeping a secret it has only partly agreed to share.