Souterrains, man-made underground passages and chambers typically associated with early medieval Ireland, were constructed for purposes that remain debated, with storage, refuge, and concealment all proposed at various points. This one had gone entirely undetected, buried beneath a working tillage field on a north-north-west-facing slope in County Cork.

The collapse revealed access through the eastern end of the roof, allowing surveyors to examine the interior. The chamber is rectangular and earth-cut rather than stone-lined, measuring 3.5 metres in length, with a maximum width and height of 1.36 metres each, making it a confined but navigable space. At its western end there is a blocked-up construction shaft, 0.6 metres wide and 0.83 metres high, the kind of opening left during the building process and typically filled in once the structure was complete. More intriguing is an opening at the south-south-east end, 0.63 metres wide, which may connect to a further chamber or to an original entrance passage. That opening was blocked with spoil at the time of examination and could not be explored, so the full extent of the souterrain remains unknown.