But on a platform to the north-east of the southern stairway, a different and less celebrated structure quietly awaits notice: a possible subrectangular enclosure whose drystone walls have partially collapsed, sitting half-buried under rubble and overgrowth.

What survives is modest in scale but oddly suggestive. The main wall runs roughly north-east to south-west and measures around 6.3 metres in length, surviving to a height of about 0.55 metres and a thickness of 0.8 metres. From its south-western end, a shorter return wall of approximately 3 metres extends away in a west-north-westerly direction, sketching out what might have been a corner or enclosing angle. At the north-eastern end of the longer wall, there is a clean break in the stonework, though the wall line continues at a noticeably lower level before disappearing into accumulated rubble; this transition has been read as the possible site of an original entrance. Drystone construction, in which stones are carefully laid without mortar, was the dominant building technique on Skellig Michael, and the island's exposure to Atlantic weather means that even solid walls deteriorate quickly once neglect sets in. Whether this particular enclosure was connected to the monastic complex or represents an earlier or later phase of activity on the rock is not recorded. The interior, for now, gives nothing away, obscured as it is by collapsed material and vegetation.

The structure sits on a natural platform, positioned in relation to the southern steps, one of the ancient cut-stone stairways that zigzag up the near-vertical rock face. That location, slightly aside from the main monastic path, may account for why this enclosure receives so little attention compared to the dramatic architecture further up the island.