The souterrain here measures roughly ten metres in length and three and a half metres across, oriented east to west, but none of that can be verified by eye today. It is, by any account, inaccessible and collapsed, which places it in a category of archaeological features that are known to exist without being knowable in any direct sense.

Souterrains are underground stone-lined passages associated with early medieval settlement in Ireland, typically built beneath or adjacent to ringforts. They served various purposes depending on the site, most likely food storage, refuge, or both. The ringfort at Togher to which this one belongs sits just to the east of the collapsed passage, and the pairing is typical enough; souterrains are very often found within or immediately beside these circular enclosed settlements, which were the dominant farmstead type in Ireland from roughly the sixth to the twelfth century. What makes this example quietly notable is simply the degree of its disappearance. The dimensions are on record, the orientation is on record, but the structure itself has subsided into the ground, and access is not possible.