No earthwork, no depression, no visible sign of anything at all. The structure only became known through investigation, and even then much of it remained unresolved.

A souterrain is an underground stone or earth-cut passage or chamber, typically associated with early medieval ringforts and thought to have served as storage space, a refuge, or both. This particular example sits within what was once a ringfort, the enclosing earthwork of which has since been levelled entirely. McCarthy, writing in 1977, documented three roughly circular cells connected by creepways, the narrow low passages that force anyone moving between chambers to crouch or crawl. The first cell is the most substantial: stone-built, measuring around 1.4 metres long and 1.8 metres wide, roofed with capstones. From its north-east side, a lintelled opening leads through a creepway into a second cell, this one earth-cut rather than stone-built, its ceiling formed into a barrel vault. A small upright pillar, just 0.4 metres high, stands at the north-west side of the first cell, which McCarthy interpreted as a jamb for a creepway heading westward toward a third cell. That western passage is now blocked. A third creepway at the south side of the first cell was not explored at the time of investigation, so the full extent of the complex remains unknown. The combination of construction methods, stone-built in one cell and earth-cut in another, with at least two and possibly three radiating passages, makes this a reasonably elaborate example of its type, even if its current condition is difficult to assess.