It is a souterrain, a type of man-made underground structure built during the early medieval period, typically consisting of one or more stone-lined chambers or passages cut into the earth. These structures are found across Ireland in their hundreds, and scholars continue to debate their exact purposes, with theories ranging from food storage and refuge to ritual use. What makes each individual example interesting is the particular landscape and community that produced it, and Ballyteige's remains tantalisingly unelaborated.

Souterrains in County Clare tend to be associated with early Christian-period settlement, roughly between the sixth and twelfth centuries, when ringforts and other enclosed farmsteads were the dominant form of rural habitation. The underground passages were often connected to such enclosures, providing a concealed space accessible from within the settlement above. Clare's geology, with its limestone karst and glacial till, shaped how these structures were constructed locally, sometimes taking advantage of natural fissures or using the county's abundant flat stone for dry-stone lining. Without more detailed field records available for this particular site, the precise form, dimensions, and condition of the Ballyteige souterrain remain unclear, but its very existence points to a period of organised rural life in this part of the county that predates any surviving built structure by many centuries.