The site is modest in scale, the cave mouth standing less than a metre high, and yet it represents something genuinely unusual: a souterrain, an artificially constructed underground passage or chamber typically associated with early medieval settlement in Ireland, built not from scratch but grafted directly onto the entrance of an existing natural cavity in the bedrock. Where the cave's roof runs out, a massive stone lintel takes over, carrying the structure westward. By the time the Ordnance Survey mapped the area in 1915, local memory had simplified the whole thing to a single word on the sheet: Cave.

The natural passage runs just over three metres into the bedrock terrace, narrowing and lowering as it goes, from roughly 70 centimetres high at the mouth to about 50 centimetres at the back. Collapsed drystone walling extends westward from the cave entrance, which suggests either that the souterrain originally continued further in that direction or that a building once stood over the entrance, shielding and perhaps disguising it. The relationship between underground passage and surface structure is a recurring feature of souterrains across Ireland, where they were often connected to a dwelling and used for storage or refuge. A small galvanised animal shelter, built from drystone and sitting directly on the bedrock terrace above the cave, is a later addition, giving the site a slightly layered quality: prehistoric geology, early medieval construction, and a practical nineteenth or twentieth-century farm structure all occupying the same few square metres. Around 50 metres to the north-west lies the site of a burial ground, and the cave itself has yielded bones, some of which were identified as human. All were subsequently returned to the place they had originally been found.