A souterrain, as these structures are known, is a drystone-built underground gallery, typically associated with early medieval settlement in Ireland, and thought to have served for storage, refuge, or both. This one is tucked into the south-western quadrant of a rath, the circular earthwork enclosure that would once have defined a farmstead, and what remains accessible today is only a fragment of what was once a considerably longer structure.

The surviving passage runs roughly north-west to south-east, measuring around five metres in length and 1.8 metres wide, with access through a small gap at the north-western end. Collapse is visible at both ends, and the structure's full original extent appears to have been substantially greater. According to the landowner, the passage once continued approximately eleven metres further to the north-east from its south-eastern end. At that terminal point, a large flagstone, now grassed over, may represent a roof lintel, the last visible trace of a tunnel that has otherwise been swallowed by the ground. The site was noted by McCaffrey in 1952, where it appears as entry number 106 in what was evidently a systematic cataloguing of local monuments.