The only outward clue is a depression in the ground just inside the north-north-east bank of the fort, a slight hollow that could easily be walked past without a second thought, but which archaeologists have cautiously flagged as a possible indicator of something beneath. A souterrain is an underground stone-lined passage or chamber, typically constructed during the early medieval period and associated with ringforts across Ireland. Their precise purposes are still debated, with shelter, storage, and refuge all proposed, but in this case even the basic facts of the structure are out of reach.

The record for this site is unusually thin. When the archaeologist M. J. O'Kelly noted it in 1946, the souterrain was already described as closed, with no further details recorded. That single reference, made nearly eighty years ago, remains the primary source of what little is known. The ringfort itself sits in the landscape as the visible component of what may be a more complex site, but without excavation or detailed survey, the souterrain beneath it stays essentially undocumented. Whether it is fully collapsed, deliberately backfilled, or simply obscured by accumulated soil is not recorded anywhere.

What gives the site a quiet strangeness is precisely this incompleteness. It is a place defined as much by absence of information as by anything that can be physically observed. The depression in the bank is real, the ringfort is real, and the 1946 reference is real, but the souterrain itself remains a question mark pressed into the earth.