It is the entrance to a souterrain, an underground passage or chamber built using drystone construction, where stones are laid without mortar, relying on careful placement alone for structural integrity. These underground spaces were a common feature of early medieval Ireland, typically used for storage, refuge, or both, and are frequently found in association with raths, the circular earthwork enclosures that once served as farmsteads for rural families between roughly the fifth and twelfth centuries.

This particular souterrain sits within what is believed to have been one of those raths, though the enclosing earthwork has entirely vanished from the surface. The ground has been levelled or worn smooth over the centuries, leaving no visible bank or ditch to suggest the settlement that once stood here. What remains is the souterrain alone, its access hole still present, a small opening that leads into the drystone-built underground structure below. The association with a probable rath places it within a recognisable tradition of early Irish rural life, even if the homestead above ground has left no trace.