These structures are found across Ireland in considerable numbers, typically associated with nearby settlement sites, and their exact purpose has long been debated. Likely uses include storage, since the underground temperature stays relatively constant, and refuge, since a narrow stone passage is considerably easier to defend than an open farmstead. The name Ballybeg itself, from the Irish Baile Beag meaning small townland or small settlement, hints at a modest but inhabited landscape, the kind of quiet rural place where such a structure might quietly persist for centuries without attracting much attention.

Beyond its classification and location, the specific details of this particular souterrain remain undocumented in publicly available records. What can be said in general terms is that souterrains in the west of Ireland were typically constructed during the early Christian period, roughly between the seventh and twelfth centuries, and were often integral to ringfort settlements. They were built without mortar, relying on carefully placed dry-stone walling and large capstones to form roofed passages that could extend several metres underground. Whether this example survives intact, has partially collapsed, or remains visible at the surface is not currently known from open sources.