This one offers nothing at all. At Creggane in County Cork, a souterrain is believed to lie somewhere beneath an old enclosure, yet there is no visible surface trace to confirm it. A souterrain is an underground stone-lined passage or chamber, typically built during the early medieval period and associated with nearby settlements or ringforts. They served as places of refuge, storage, or concealment. Here, even the knowledge of one is second-hand, preserved not in any physical remnant but in local tradition alone.

What survives is the memory. According to information gathered from people in the area, there is a tradition of a souterrain within the fort at Creggane, situated inside an enclosure that has its own separate record. Whether the underground structure was ever excavated, collapsed, or simply never disturbed, nothing now breaks the surface to mark its presence. It exists, if it exists at all, as a piece of inherited local knowledge, the kind that tends to persist in rural Irish communities long after the physical evidence has gone quiet.