The surface gives little away: a slightly buckled field, a gap between two large stones, and the faint suggestion that the ground is hollow. These are the visible traces of a souterrain, an artificially constructed underground chamber or tunnel, typically built during the early medieval period and used for storage, refuge, or both.

The cashel itself, a circular stone-walled enclosure of the kind common across Munster, contains the souterrain within its northern half. When investigators recorded the site in the 1940s, a stone stairway descending to the underground passage was still identifiable, though the upper portion of the stairway had already vanished by that point. Local knowledge held that the passage continued westward from the foot of those steps, though how far it extended, and whether it connects to any other structure, is not recorded. The entrance has since been blocked with large stones, a practical measure against the risk of collapse.

What remains visible is modest but quietly telling: a slight unevenness in the ground, the kind of irregularity that most walkers would step over without a second thought. The blocked entrance sits between two substantial stones in the northern section of the cashel, and the surrounding ground still betrays the shape of something deliberate beneath it.