It is a souterrain, a type of structure built during the early medieval period, typically between the seventh and twelfth centuries, consisting of one or more corbelled or dry-stone chambers connected by low crawlways and set deliberately below ground. Their precise purpose is still debated; they may have served as refuges, as cool stores for dairy produce, or as places to conceal valuables during raids. Whatever the function, they required considerable communal effort to construct, and their presence in a townland is usually a reliable indicator of sustained early medieval settlement nearby.

Luffertan sits in Sligo, a county whose landscape holds a dense and varied archaeological inheritance, from megalithic tombs on the Carrowmore plateau to early Christian enclosures scattered across its drumlin fields and coastal margins. A souterrain in this setting would fit a well-established regional pattern, though the specifics of this particular example, its dimensions, the number of chambers, its condition, and any associated surface features, remain formally undocumented in publicly accessible sources at this time. That absence is itself a small reminder of how much early medieval infrastructure remains recorded only in specialist archives rather than in any form easily reached by the curious visitor or amateur researcher.