These structures are found across Ireland in their hundreds, typically associated with nearby ringforts or settlement sites, and served variously as places of refuge, cool storage for food, or concealed escape routes. The one at Callanafersy is recorded among Ireland's archaeological monuments, though the details of its construction, dimensions, and condition remain unpublished in any accessible public form.

Souterrains were generally built by roofing over a dug trench with large stone lintels and then covering the whole with earth, making them effectively invisible at ground level unless you know precisely where to look or happen to fall into one. Kerry has a particularly dense concentration of such features, a reflection both of the county's heavily settled early medieval landscape and of how well underground stonework survives in wet Atlantic conditions. Without further documentation available for this specific site, it is not possible to say whether the Callanafersy example is a simple single-passage type or something more complex, nor whether it remains structurally intact. It exists, for now, as a named point on the archaeological record, a reminder that the ground across this part of Munster is considerably more layered than it appears.