These structures were typically used for storage, refuge, or both, and they tend to survive as much through accident as design, their roofing stones gradually collapsing or being robbed out over the centuries.

This particular example runs on a roughly east-south-east to west-north-west alignment and extends to more than nine metres in length, with a maximum width of around two and a half metres. At its eastern end, two of the original roof lintels are still in place. One of them remains seated on its drystone side-walls, the two faces of unmortared stone standing 1.6 metres apart, preserving a small but legible fragment of the original construction. The site was recorded by McCaffrey in 1952, and sits within what is recognised as a wider ecclesiastical enclosure, suggesting that whatever community once occupied this ground, they built not only above it but beneath it too.