The slabs measure roughly 3.6 metres long and 2 metres wide, sitting only half a metre down, which gives the impression of something barely concealed rather than properly buried. Whether the chamber beneath is intact, collapsed, or largely imagined is not recorded.

The structure is a souterrain, an underground passage or chamber typically built during the early medieval period in Ireland, most often associated with ringforts. Souterrains were likely used for storage, as places of refuge, or both, and they occur with some regularity inside the circular earthwork enclosures that dot the Irish countryside. The ringfort at Sparrograda, recorded separately in the Cork sites inventory, provides the broader context: these earthen or stone-walled enclosures were the farmsteads of early medieval families, and the souterrain would have been an integral part of that domestic arrangement. The fact that this one sits in the southern quadrant of the fort, close to the entrance, is itself a fairly typical placement. What is less typical is the way it presents itself now, four slabs in a sunken hollow rather than a fully excavated or clearly visible passage, suggesting the surrounding ground has shifted or settled over the centuries without anyone digging further.