What makes it more than just a ruined wall is what lies beneath it: a souterrain, an underground passage built from carefully arranged drystone, opening from the interior of the hut through a gap just over a metre high and less than a metre wide. The upper courses of the passage lean inward in a technique called corbelling, where successive stones project slightly over one another to narrow the space before a lintelled roof closes it off. The passage itself runs toward the south-west and is now inaccessible, but its existence transforms what might otherwise seem a modest agricultural ruin into something considerably older and more deliberate.

Souterrains of this kind are found across early medieval Ireland, typically associated with settled farmsteads from roughly the sixth to the twelfth centuries. They were used for storage, and possibly for refuge, their consistent cool temperature making them well suited to preserving food. The hut here measures approximately five metres across and survives to a height of around 1.2 metres, with some notably large stone blocks worked into its drystone construction, that is, walls built without mortar, relying entirely on the weight and arrangement of the stone. The walls of the souterrain passage are roughly 2.7 metres thick at their widest. No excavation record is available in the published survey to clarify when the structure was built or by whom, and the site carries no dramatic associations, only the quiet evidence of a community that understood how to make the land and its stone serve them across the seasons.