There is no hollow in the ground, no telltale depression, no stone protruding from the soil. The site is recorded, catalogued, given a grid reference and a classification, and yet it leaves nothing for the eye to find. That invisibility is, in its own way, the most interesting thing about it.

A souterrain is an underground stone-lined passage or chamber, typically constructed during the early medieval period in Ireland. They are found across the country in considerable numbers, often associated with ringforts or other enclosed settlements, and their precise function is still debated, though storage and refuge are the explanations most commonly offered. This particular example sits in the south-western quadrant of an earthwork in Dunderrow, a small townland in County Cork near Kinsale. The earthwork itself is a separate recorded feature, and the souterrain presumably once served whoever occupied or used that enclosure. Beyond that association, the specific history of this site is not known.