This is a souterrain, an underground chamber or tunnel built from drystone masonry, typically associated with early medieval settlement sites in Ireland, where such passages may have served for storage, refuge, or concealment. What makes this particular example quietly odd is its setting: it lies not within the main enclosure here but just outside it, tucked against the enclosure wall, which the hut builders appear to have borrowed as part of their own structure. The souterrain is now inaccessible, but a lintelled opening in the south-western wall of the better-preserved hut gives onto its entrance, and the passage can be seen running north-west along the line of the cashel wall.

The complex as a whole sits on the eastern side of the Saint's Road, the ancient route that climbs to the pilgrimage site on the summit of Brandon Mountain. The main enclosure is roughly oval and stone-walled, containing a clochaun (a small corbelled stone hut), two leachts (low rectangular stone cairns associated with devotional practice), a cross-slab, and graves that point to its later use as a calluragh, a burial ground for unbaptised infants. Outside this enclosure, to the north-east, two clochauns were built against the cashel wall, with a rough terrace cut into the slope to accommodate them. The terrace edge is faced with dry stone masonry up to 0.7 metres high for a length of about eleven metres. The more intact of the two huts measures seven to eight metres in diameter externally, and its corbelled drystone wall, where the stones are laid in overlapping courses to form a self-supporting dome, survives to a maximum height of 1.75 metres. The second hut has largely collapsed into mounds of stone, though its entrance, around 0.7 metres wide on the south-east side, remains partly legible. This site was documented in the Dingle Peninsula archaeological survey published by J. Cuppage in 1986.