A souterrain, for those unfamiliar with the term, is an artificially constructed underground chamber or tunnel, typically built during the early medieval period in Ireland, most likely for storage, refuge, or both. They are found across the country in their hundreds, often associated with ringforts, and are frequently stumbled upon by farmers rather than archaeologists. The one at Knocknageeha is recorded as a monument, which means it has been formally noted as a site of archaeological significance, but beyond that, the public record is currently sparse.