There is nothing on the surface to suggest it exists at all, no depression in the ground, no exposed stonework, no obvious disturbance. It is simply there, or so the record insists, sealed under the earth inside the western bank of an earthen ringfort.

A souterrain is an underground stone-built passage or chamber, typically associated with early medieval ringforts in Ireland, and thought to have served as a place of refuge, food storage, or both. The one at Curraghawaddra was recorded by Hartnett in 1939, who described a single chamber measuring nine feet by four feet and five feet high, its roof formed by five large flat lintels laid across the top. The entrance was located inside the western bank of the enclosing ringfort. It is a compact, carefully constructed space, the kind of thing that required real effort to build and real intention to conceal. Hartnett's dimensions give it a quality of specificity that the landscape above it entirely refuses to confirm.

The absence of any visible surface trace is not unusual for souterrains, many of which survive only because they were never disturbed rather than because they were ever meant to be found again. What remains at Curraghawaddra is essentially a documented void, a chamber whose measurements are known but whose interior has not been described since 1939.