A small hollow slopes downward in an easterly direction, and about four metres to the east of it, a section of collapsed earth exposes the roof of a chamber below. The chamber has creepways, narrow connecting passages low enough to require crawling, leading off to the east, west, and south. Nobody, as yet, has gone in.

The structure is a souterrain, an underground passage or chamber cut into the earth or built from stone, typically associated with early medieval ringforts across Ireland. They are thought to have served as places of refuge, cool storage for dairy produce, or both. This particular example sits within its ringfort as an ancillary feature, the kind of detail that would be invisible to a passing eye were it not for the tell-tale depression in the ground. The collapsed section that reveals the chamber is not an entrance so much as an accident, a slow subsidence that has opened a small window into something that has otherwise been left entirely undisturbed. No excavation has taken place, and the interior arrangement of the creepways suggests a more complex layout than a simple linear tunnel, though precisely what lies along each of those three passages remains unknown.