Souterrains, which are man-made underground stone-lined tunnels or chambers built primarily during the early medieval period, are scattered across Ireland in considerable numbers, yet many remain poorly documented, tucked into farmland or beneath rough grazing, known mainly to those who work the ground above them.

The place name Tearmann Caithreach carries its own quiet weight. "Tearmann" in Irish typically denotes a sanctuary or church land, territory set apart under ecclesiastical protection in the early medieval period. The combination suggests this was once ground associated with a religious settlement or monastic enclosure, which would sit comfortably alongside the presence of a souterrain. Such underground structures are frequently found in proximity to early ecclesiastical sites, where they may have served as storage for food or valuables, or as places of refuge during periods of raiding. Beyond the name of the townland and the bare fact of the structure's existence, the documentary record for this particular site remains thin.