By the time the Ordnance Survey produced its second edition maps, the structure had already been downgraded to a 'site of', and today nothing visible remains at all. What exactly stood here is genuinely uncertain: the name suggests a church or oratory dedicated to a Saint Dermot, yet the earliest surveyors described it simply as the ruins of a small house. Whether it was a formal ecclesiastical building, a hermitage of the kind that early Irish monks sometimes sought out in remote mountain terrain, or something else entirely, nobody has been able to say with confidence.

The site was associated with the grave of a figure recorded as 'Dearmuid O'Dinna', whose burial was noted in the south-west corner of the ruins. The name Teampall Diarmada links the place to a Dermot, and the later description as 'an ancient church or hermitage of Dermot' suggests local memory of a religious connection persisted even as the physical remains disappeared. Around 100 metres to the south-east, the foundations of a small hut survive separately, hinting that whoever occupied this remote terrace may have done so across more than one structure. The location itself is telling: a coom, a deep hollow carved by glacial action into the mountain's side, offering shelter from the prevailing weather and, from its open southern edge, long views across Kenmare Bay to the Beara Peninsula. It is the kind of place an early medieval hermit might have deliberately chosen, far from settled land but not entirely without prospect.