No one is quite sure any more. The only clue left on the surface is a shallow dip in the ground near the north-eastern edge of a rath, the circular earthwork enclosure within which the feature sits. That slight depression, where the soil has subsided, is thought to mark a collapsed chamber of a souterrain, one of the dry-stone underground tunnels that early medieval communities in Ireland built beneath or beside their settlements, most likely for food storage, refuge, or both.

For a time, there was more to see. In the 1930s, a Capt. D.B. O'Connell noted that the opening of an underground passage was still visible within the rath. By the time anyone looked again, that entrance had been closed, reportedly for a long while before that. Whether it was deliberately blocked, or simply silted and collapsed, is not recorded. What remains is the rath itself and that ambiguous hollow in the earth to the north-east, hinting at a chamber that may yet be largely intact beneath the surface, sealed off from the world above it.