No hollow in the turf, no collapsed lintel, no telltale depression gives it away. It is recorded, catalogued, and essentially invisible.

A souterrain is an underground stone-built passage or chamber, typically associated with early medieval settlement in Ireland, used variously for storage, refuge, or ventilation. They are usually discovered by accident, or else noted by earlier fieldworkers who caught them at a moment when the ground had not yet swallowed the evidence entirely. In this case, the record goes back to McCaffrey, writing in 1952, who listed the souterrain among a series of such features in the region. It sits within the interior of a cashel, a type of dry-stone ringfort enclosed by a circular wall, the cashel itself still present as a separate monument. What lies beneath, though, has left no visible surface trace. Whether it collapsed inward over the decades since McCaffrey observed it, or whether it was always concealed and identified through other means, is not recorded.