It is a souterrain, a type of structure built during the early medieval period in Ireland, typically consisting of one or more corbelled or dry-stone chambers connected by low crawlways and dug into the earth or constructed beneath ground level. Their precise purposes are still debated, though most scholars associate them with storage, refuge, or a combination of both. That one exists at Keevagh is, for now, almost the entirety of what is publicly known about it.

The souterrain tradition in Ireland spans roughly the sixth to the twelfth centuries, and Clare has its share of examples, often found in association with ringforts, the enclosed farmsteads that were the dominant form of rural settlement during that period. Whether the Keevagh example follows that pattern, how many chambers it contains, whether it has been excavated, and what condition it is in, are details that remain, for the moment, out of reach. It is a place that exists more fully in the archaeological record than in the public one.