To recap i recall as a young lad being told a story by my grandfather, that when he was digging in one of his fields on the bridal loanan, they uncovered what appeared to be an entrance to an ancient cave.
A team of archaeologists came over from England to investigate, and confirmed it was not a cave, but in fact an ancient passage or "subterranean tunnel" heading inland towards the Upper Dromore road, unfortunately due to the outbreak of the 2nd world war, nothing more was done and the entrance sealed up (for safety) I even remember standing in the field and having the entrance pointed out to me.
I had more or less forgotten about the story, until I read a very small article in an old book when doing research.
I'll quote the exact text here:
"There was, and still is as far as I know, a spot about 500 yards up the (old) Burren road from the junction between this and jenny Blacks hill (up towards the Donaghaguy road) which gives a hollow ringing sound if stamped upon. We never failed to try this out when either walking with our parents or roving the country for Blackberries.
We were told mysteriously that an underground tunnel existed from the Rath to a point of exit on the Rampart bank a means of escape in those far off days when Carlingford lough was the attack route for the Danes or mauraders.
Sure enough, during the excavations by the firm of F.G.O'Hare for the luxurious and modern Saint Marks Secondary school on the upper dromore road, reference was made in the "Newry Reporter" to the unearthing of a soutuain or chamber and this was on the supposed route of the presumed subterranean passage we had lived with in imagination.
So, putting those 2 stories together certainly gives some thought to the fact that there is (or was) some sort of passage.
With all the building that has gone on recently, the chances of ever finding anything remains small, but I do note that not all of the ground that lies on the path of the supposed tunnel has been built on yet, so who knows what could be found in the future