It is easy to dismiss as a wet patch, a quirk of drainage, or a trick of the terrain. But its dimensions, 8.5 metres long and just under 5 metres wide, suggest something more deliberate underneath, the probable ghost of a souterrain.

A souterrain is an underground stone-lined passage or chamber, typically associated with early medieval ringforts, known in Ireland as raths. Builders constructed them for a variety of purposes, most likely cold storage, refuge during raids, or concealed escape routes. The rath at Drumloman would have been a circular enclosure defined by an earthen bank, the standard form of defended farmstead used across Ireland roughly between the sixth and twelfth centuries. The depression recorded here lies inside that bank at the north-east, which is precisely where souterrain entrances are often found, tucked against the inner face of the enclosing earthwork. Whether the original passage has collapsed, been robbed of its stonework, or simply filled with sediment over the centuries, the waterlogging now makes the void visible in a way that drier ground would not.