Souterrains, the name drawn from the French for "underground air", are among the more enigmatic features of early medieval Ireland. Built during the first millennium and into the early centuries of the second, they were constructed from carefully arranged drystone walling and roofed with large capstones, creating tunnels and chambers that could run for several metres beneath the surface. Their purpose remains debated: some were used for food storage, taking advantage of the cool, stable underground temperature; others may have served as places of refuge, their deliberately low and narrow entrances making armed pursuit difficult.

Creevagh Beg sits in a county already well supplied with prehistoric and early medieval remains, from the limestone pavements of the Burren to the ring forts and field systems that dot the landscape. The presence of a souterrain here is consistent with a pattern seen across Munster and beyond, where underground structures were often associated with nearby ringforts, the circular earthwork enclosures that served as farmsteads for early Irish families of some local standing. Whether the souterrain at Creevagh Beg survives intact, partially collapsed, or visible at the surface is not currently documented in available public records, which means the site exists for now in a kind of archival limbo, recorded but not yet described in any accessible detail.