That dip in the earth marks the position of a souterrain, an underground structure of the kind built throughout early medieval Ireland, typically consisting of stone-lined chambers connected by narrow crawlways known as creepways. They were used variously for storage, refuge, or ventilation, and were often integral to the settlements above them.

What makes this particular example quietly compelling is that most of what is known about it came not from formal excavation but from local memory. At some point, material was removed from the depression, and the people who knew about it reported finding three or four chambers linked by those characteristic creepways. It is the kind of knowledge that passes between neighbours rather than appearing in official records, which makes it both valuable and difficult to verify. A second shallow depression lying a short distance to the south of the first may also be connected to the same underground system, suggesting the souterrain could be more extensive than the surface evidence alone would indicate. The ringfort itself, a roughly circular enclosure defined by earthen banks and ditches that was a common form of farmstead in early medieval Ireland, provides the broader context. Souterrains were frequently built inside or beneath the banks of such enclosures, making this pairing entirely consistent with the archaeological patterns found across Munster and beyond.