Souterrains are underground stone-built passages or chambers, constructed during the early medieval period in Ireland, most likely used for storage, refuge, or both. This one, recorded through local information rather than formal excavation, is described simply as closed up, its entrance blocked, its interior unexamined in any detail that has been made public.

The site sits within a landscape that has quietly accumulated archaeology over millennia, the Iveragh Peninsula being one of the more densely recorded parts of Kerry. Souterrains across Ireland tend to appear in association with early medieval settlements, often tucked beneath or beside a ringfort, and the Iveragh survey catalogued a considerable number of them across the peninsula. This particular example at Killoe is known largely because someone local knew it was there, which is itself a reminder of how much archaeological knowledge still circulates as memory and word of mouth rather than published record. Beyond its location on the southern slopes of Bentee and its current sealed condition, the details of its construction, length, or date remain unrecorded in any accessible form.