A souterrain, to use the technical term, is an artificially constructed underground chamber or series of passages, typically built during the early medieval period in Ireland. They were dug or built from stone and covered over, often attached to a nearby settlement, and are thought to have served as places of refuge, cold storage, or concealment. The Burren region and its fringes are already known for an unusual density of prehistoric and early medieval remains, and Poulawack itself sits within a landscape that includes a notable Bronze Age cairn cemetery, making the presence of a souterrain here entirely consistent with a long pattern of human activity in the area.

Beyond its classification and location, the documentary record for this particular souterrain is presently thin. What can be said is that souterrains in Clare tend to date from roughly the sixth to the twelfth centuries, and they are frequently found in association with ringforts, the circular earthen or stone enclosures that were the standard farmstead of early medieval Ireland. Whether the Poulawack example follows that pattern, its dimensions, its state of preservation, or the circumstances of its discovery, remain details that the available record does not currently supply.