Each depression has an opening at its centre, and together they suggest an underground passage running on a roughly north-north-west to south-south-east axis. Peer through the larger of the two openings, which measures about 1.9 metres by 1.4 metres, and the chamber of a souterrain becomes visible: a space around 1.6 metres high, possibly cut directly from the earth rather than lined with stone, with what appears to be a curving roof.

A souterrain is an artificially constructed underground passage or chamber, most commonly associated with early medieval settlement in Ireland, typically dating from around the sixth to the twelfth century. They are frequently found within raths, the circular earthen enclosures that served as farmstead boundaries during the same period, and their precise function has long been debated. Refuge, food storage, and ventilation have all been proposed, and it is quite possible they served more than one purpose depending on circumstance. This particular souterrain sits within a rath designated in the county record as KE108-018, the enclosure providing its immediate context. The earth-cut construction visible here, if confirmed, is notable: many souterrains are built from dry-stone corbelling, so a chamber shaped directly from the subsoil, with a curving rather than angular roof line, suggests a slightly different constructional approach, though not an unparalleled one in Kerry.