A souterrain is an underground stone-lined passage or chamber, typically associated with early medieval settlement in Ireland, and often interpreted as a place of refuge or storage. This one, however, barely registers on the historical record at all. It never appeared on the Ordnance Survey six-inch map of 1837, nor on the revised twenty-five-inch edition of 1913, leaving it absent from over a century of cartographic documentation.

The site first came to attention in 1977, when it was described as a possible souterrain and marked with a handwritten 'X' on an Ordnance Survey working map, with a note that it had not been previously recorded. That cautious qualifier, 'possible', has never been resolved. The entrance is now partially blocked and the structure is largely inaccessible, meaning any direct investigation would be difficult. Aerial photography adds little; no surface remains are visible from above. What survives, in effect, is a question mark in a field, acknowledged once in passing and then left to its own quiet obscurity.