This one offers nothing of the sort. At Doonasleen in north Cork, within the earthen enclosure of a ringfort, there is a souterrain that cannot be seen at all. A souterrain is an underground stone-lined passage or chamber, typically built during the early medieval period and associated with the ringforts that dot the Irish countryside; they were used variously for storage, refuge, or both. The one at Doonasleen has been infilled, leaving no visible surface trace.

What is known comes from a single recorded observation. Bowman, writing in 1934, noted the presence of a souterrain here and recorded that it had already been filled in by that point. The ringfort it belongs to is itself a modest earthwork, the kind found in considerable numbers across Cork and the wider country, most dating from roughly the sixth to the twelfth centuries. The souterrain would have been an integral part of that enclosed farmstead, dug beneath the interior and roofed with stone lintels, its entrance concealed. That it was infilled before anyone could properly examine it means the details of its construction, its dimensions, and whether it contained any finds, are simply lost.