What it revealed was a souterrain, an underground stone-lined passage or chamber used in early medieval Ireland typically for storage, refuge, or both, built without mortar and roofed with a series of flat slabs laid across the top. The chamber sits just above the valley floor, which suggests it was constructed to remain dry and accessible, tucked into the slope rather than dug into low-lying ground where water might collect.

The site lies in Gleann Seanchoirp, a quiet valley on the Dingle Peninsula in the heart of Corca Dhuibhne, the Irish-speaking district that occupies the western end of the peninsula. Drystone construction of this kind, where stones are carefully fitted together without any binding material, is characteristic of early Irish underground structures, and the use of flat capstones for roofing is a technique found across souterrains throughout Munster and beyond. The find was documented by J. Cuppage in the 1986 Corca Dhuibhne archaeological survey, which catalogued the remarkable density of prehistoric and early medieval remains across the Dingle Peninsula. The fact that it came to light through agricultural work rather than formal excavation is itself telling; such structures often survive beneath farmland for centuries, noticed only when a blade catches a stone at an unexpected angle.