The hollow, weed-grown and grass-softened, stretches roughly 7.2 metres in a north-north-west to south-south-east direction, widening from around 2.1 metres at one end to nearly 4.8 metres at the other, and dropping to a depth of about 1.2 metres. At its midpoint, large stones break the surface. The official interpretation is that this is a souterrain, an underground stone-lined passage or chamber built during the early medieval period, typically for storage or as a place of refuge. What makes this one quietly compelling is the story folded into the landscape around it.

According to local tradition, there is a cave somewhere within the ringfort, and the depression itself is not the original feature but the aftermath of an attempt to break into it. Someone, at some unrecorded point, dug down trying to reach whatever lay beneath, and the hollow they left behind is what visitors encounter today. The ringfort, a roughly circular enclosed settlement of early medieval Ireland typically defined by one or more earthen banks, provides the broader context: souterrains are frequently found within such enclosures, built by the same communities that raised the banks around them. Here, the relationship between the two features is legible in the ground itself, even if the cavity that prompted the digging has never been properly located or excavated.