The catch is that nobody can say for certain it is there at all. No depression in the earth marks its entrance, no scatter of stone hints at a collapsed roof, and no excavation has confirmed what local tradition has long maintained. The site is, in every visible sense, just a field.

The souterrain is said to be associated with a ringfort that once stood on the same ground, now recorded but effectively erased, its banks and ditches levelled over time by centuries of agricultural use. Ringforts, the circular enclosed settlements that dot the Irish countryside in their thousands, were built predominantly between the sixth and tenth centuries, and souterrains were a common feature of them, dug by hand and roofed with stone lintels before being buried beneath the interior. That both structures here are now invisible makes this a doubly absent site: a passage beneath a settlement that is itself no longer there, surviving only as a reference number and a thread of local memory.