At the base of this hollow, an oval opening barely wide enough to admit a person, roughly 0.8 metres by 0.6 metres, drops into an earth-cut souterrain extending southward into the ground. A souterrain is an underground passage or chamber, typically associated with early medieval settlement in Ireland, and generally thought to have served as a place of refuge, storage, or concealment. This one, cut to a depth of around 1.25 metres, has a partially blocked entrance where stones and collapsing clay have begun to reclaim it.

What makes the site quietly compelling is not the souterrain alone but the cluster of features around it. Approximately two metres to the south lies the remains of a hut site, and some sixteen metres to the west, a field boundary survives in the same rough pasture. Together, these three elements suggest a small but coherent early settlement, a household at the edge of a bay, making use of the ground itself for whatever needed to be kept cool, safe, or hidden from view. The peat covering the hillock has likely helped preserve the profile of the depression, keeping the entrance visible even as the stonework inside gives way.