That claim has never been verified, and the ground itself gives nothing away; no depression, no hollow, no tell-tale dip in the field surface survives to mark where these tunnels might lie.

A souterrain is a man-made underground passage or chamber, typically stone-lined, associated with early medieval settlement in Ireland. They were used for storage, refuge, or both, and are frequently found in association with raths, the circular earthen enclosures that once served as farmsteads across the Irish countryside. The Roxborough example sits in pastureland beside one such rath. When investigators examined the site in October 1956, what they found was essentially a memory: local people described a souterrain connecting the rath to a ringfort to the north, but no physical evidence remained visible at the surface. A second visit in November 1982 produced something slightly more tangible. Residents recalled that, a few years earlier, the digging of a drain or trench nearby had broken into a tunnel roughly three to four feet square, running on a direct line between the rath and the road to the north. The dimensions are consistent with known souterrains elsewhere in Ireland, yet no surface trace was recorded then either.

What makes the site quietly compelling is precisely its elusiveness. The tunnel was apparently glimpsed during groundworks, noted, and then effectively resealed by time and subsequent activity. Two inspections across twenty-six years reached the same conclusion: something is almost certainly there, the local knowledge is specific and consistent, and yet the land holds it entirely out of sight.