The hole is gone now, filled in at some point within living or near-living memory, and the field beside Dromdowney Castle shows no trace of it. What remains is the story.

A souterrain is an underground stone-lined passage, typically constructed during the early medieval period in Ireland, and associated with nearby settlement or ecclesiastical sites. They were used variously for storage, refuge, or both. The Dromdowney example sits roughly 230 metres south-east of Dromdowney Castle, and the antiquarian James Grove White, writing between 1905 and 1925, recorded what local people then knew of it: a hole in the ditch on the west side of the road, said by older residents to be the mouth of a tunnel running to Killeen Church to the north-east. That church, itself a ruin, lies around 530 metres from the souterrain's reported location. Whether the passage ever actually reached it is impossible to say. Long underground tunnels connecting churches or castles are a recurring motif in Irish folk memory, and the actual extent of most souterrains is far more modest than the stories suggest. Still, the association between a souterrain near a castle and a nearby ecclesiastical site is not inherently implausible, and Grove White thought it worth recording.

The site has no visible surface trace today. What is left is essentially a location on a road, a passage in an old antiquarian volume, and the memory of what neighbours once told each other about what lay beneath the ground.