The only surface clue is a slight depression in the ground and a set of descending stone steps, the kind of detail that rewards anyone paying close attention to the texture of a field rather than its broader sweep. This is a souterrain, an underground passage or chamber system, typically built during the early medieval period, that served communities living within ringforts as a place of refuge, storage, or both.

When the souterrain was last properly inspected in 1971, the entrance opened into a passage leading to a beehive chamber, a roughly circular underground room built using drystone walling and roofed by the corbelling technique, where stones are laid in progressively overlapping rings until they meet at the top, then sealed with a large capstone. That capstone was considered at the time to be a modern repair rather than original fabric. A second entrance, positioned opposite the first, led into a slightly curving passage running roughly east-northeast to west-southwest, though it was blocked at one end. The existence of two entrances, one now the primary access point, the other sealed, suggests the structure was once more elaborate than what survives. References to the site appear in publications as far back as 1896, and it is recorded in association with the ringfort catalogued as DU017-021001, indicating it has been known to antiquarians and archaeologists for well over a century. The site was compiled by Geraldine Stout and uploaded to the national record in August 2011.

Access to the souterrain has become uncertain in recent years; the record notes it was accessible up until relatively recently, but that status may have changed. The ringfort itself is the more visible feature on approach, and the souterrain's position within the northwest interior of that enclosure is the clearest navigational guide once you are on site. The sunken area and stone steps remain visible at ground level, so even if descent into the passages is no longer possible, the outline of the structure is legible to a careful eye. Anyone with an interest in early medieval landscape archaeology will find the relationship between the ringfort and its underground annex worth examining, even from the surface.