No trace of it can be seen today; it exists in the record almost as a rumour, passed along through local memory rather than excavation.

The souterrain sits within a ringfort, one of the thousands of roughly circular earthwork enclosures that date broadly from the early medieval period in Ireland, typically associated with farmsteads of the sixth to tenth centuries. Souterrains, which are underground stone-lined or rock-cut passages, are frequently found within ringforts and are thought to have served as places of refuge, cold storage, or both. What makes the Rathduane example quietly notable is the manner of its discovery and its type: rock-cut souterrains require considerably more effort to construct than those built with dry-stone walling, and the fact that this one came to light during building work, with no formal investigation following, means its full extent remains unknown. The details come from local information rather than any archaeological dig, which leaves open the question of how much passage remains intact beneath the ground.