These structures are found across Ireland in their hundreds, usually associated with nearby ringforts or early settlement sites, and they tend to be easy to overlook precisely because so much of their interest lies below the surface.

Beyond its classification and location, the specific history of this particular souterrain remains obscure. No excavation records, no associated finds, and no detailed description of its construction or dimensions appear to have been published in accessible sources. What can be said is that souterrains of this type were generally built between roughly the seventh and twelfth centuries, using dry-stone walling and corbelled roofing, and that their presence in a townland often signals sustained early medieval activity in the surrounding landscape. Knockglass itself, like much of Mayo, sits in a region with a long and layered human past, though drawing any direct lines between this structure and broader local history would require more information than currently exists in the open record.