A souterrain, which is an artificial underground structure typically associated with early medieval ringforts and used variously for storage, refuge, or concealment, came to light only when the ground above it was levelled. The discovery was unplanned, the kind that happens when machinery meets archaeology without warning.

What emerged was a structure of considerable craft. The souterrain consisted of a passage built from upright stone slabs, roofed by a sequence of flat lintels, leading to at least two chambers. Those chambers were described as resembling underground beehive huts, each sealed overhead by a single flat slab. One of the entrances was formed by a porthole slab, a large stone with a shaped opening cut through it, a feature found in a small number of Irish souterrains and thought to have served as a controllable, defensible access point. The whole complex sat within a circular univallate enclosure, a single-ditched ringfort, which by the time it was recorded was only faintly visible on the ground, its outline surviving on the second edition of the Ordnance Survey map but barely readable as earthwork. J. Cuppage documented the site in the 1986 Corca Dhuibhne archaeological survey of the Dingle Peninsula, drawing on local accounts of the levelling and the subsequent find.