Beneath the ground lies a souterrain, an artificial underground structure of the kind commonly associated with early medieval Ireland, typically used for storage, shelter, or concealment. This one, though, has features that push it toward the more unsettling end of that spectrum. The entrance is inaccessible today, but what has been recorded inside is detailed enough to paint a fairly vivid picture of a space that was apparently designed with defence in mind.

Archaeologist Cleary, writing in 1989, documented six earth-cut chambers arranged in sequence. Three of them are rectangular, two are irregular in plan, and a sixth takes a C-shape. What makes the layout notable is not the number of chambers but how they connect. The creepholes, the narrow passages linking one chamber to the next, are deliberately constricted between chambers two and three, three and four, and four and five. Cleary interpreted this narrowing as a possible indication that the site served as a refuge, since a tight crawlspace would slow anyone trying to force their way through. Recesses cut into chambers one and five may have served a similar defensive function, perhaps allowing someone inside to pull back or brace against an intruder. Construction shafts were recorded in all chambers except the second, and a drain was found in chamber six, suggesting some practical provision for water management in what would otherwise be a damp, sealed space.

The site sits within a ringfort, a roughly circular enclosure of the early medieval period, and the combination of the two is not unusual in Irish archaeology. What is less common is a souterrain with this degree of apparent defensive elaboration, where the architecture itself seems arranged to make pursuit difficult. The site is not accessible to visitors.