The collapse of soil and stone over roughly five metres leads down to a narrow opening in the north-west wall of a cashel, a circular stone-walled enclosure of early medieval Irish origin typically used to protect a farmstead or dwelling. Beyond that entrance, just one metre wide and one and a half metres high, lies a souterrain: an underground passage built from drystone walling and roofed with flat lintel stones laid across the top. These structures are found across Ireland and were used for storage, refuge, or both, their cool interiors well suited to preserving food or concealing people.

When archaeologists Hegarty and Dowd inspected the site in 2000, they found the creepway, the low internal passage through which a person would have to crouch or crawl, partially flooded to a depth of twenty centimetres. That detail alone gives a sense of the place: a hand-built underground corridor, sealed by lintels laid by someone well over a thousand years ago, quietly filling with water in the Kerry earth. The souterrain sits within the cashel recorded separately in the county's archaeological inventory, meaning the two structures form part of the same early medieval complex, the underground passage serving whatever household or community sheltered behind those enclosure walls.