The site at An Clochán holds what is considered the most extensive souterrain on the entire Dingle Peninsula, and it is within this underground structure that the stranger details accumulate. A souterrain is a man-made underground passage or chamber, typically associated with early medieval ringforts and used for storage, refuge, or both. The ringfort here is poorly preserved, but the souterrain beneath it is, by local standards, remarkably elaborate.

The written record of the site pulls together observations made decades apart, and they sit uneasily alongside one another. Deane, writing in 1893, noted the presence of a skull and other bones in at least two of the souterrain's chambers. Champneys, writing in 1910, appears to have been describing the same remains when he recorded that two bodies had been found in a sitting position inside what he called a very elaborate souterrain near Ventry. Whether burial within a souterrain was intentional, secondary, or the result of some later use of the space is not resolved by what survives in the record. Separate from the souterrain entirely, stones being removed from the site by a previous landowner's father disturbed a small slab-lined grave, a simple burial cist formed from upright or flat stones, inside which was an iron box containing coins. No further detail about the coins or the grave's dating appears to have been recorded at the time.

The ringfort enclosure itself is now very poorly preserved, and two possible hut-sites within it add further layers to what was once a more complex settlement. The souterrain, the cist grave with its iron box, and the seated remains together suggest a site that accumulated meaning, and perhaps use, across a considerable stretch of time.