That is, in a sense, the whole story, and it is not without its own quiet interest. A souterrain is an underground stone-lined passage or chamber, typically associated with early medieval settlement in Ireland, and used variously for storage, refuge, or both. This one leaves no visible trace at the surface whatsoever.

What is known comes from a single early-twentieth-century reference. A scholar named Power noted its existence in 1917, placing it within the southern half of what may be a cashel, a type of early medieval stone-walled enclosure that would originally have defined a farmstead or small settlement. The cashel itself is described as a possible rather than a confirmed example, which layers one uncertainty on top of another. The site sits, then, at the intersection of two tentative propositions: a structure that might be a cashel, containing a souterrain that can no longer be located above ground. Whether it was already invisible to Power, or whether he had some means of identifying it that later observers have lacked, the record does not say.