A souterrain, to use the technical term, is an artificial underground structure, typically dry-stone built, dating from the early medieval period in Ireland, roughly the sixth to the twelfth centuries. They are found across the country in their hundreds, often associated with ringforts, and their precise purpose has long been debated. Refuge, storage, ventilation for a settlement above, perhaps all three at different times; the honest answer is that no single explanation fits every example.

The one at Inchincummer is recorded as a monument, which places it within a recognised class of archaeological site, but detailed information about its construction, condition, or excavation history is not currently available. Kerry is particularly rich in early medieval remains, the landscape having supported dense rural settlement during the period when souterrains were in use, and a site in this townland would fit a broader pattern of underground chambers tucked beneath or beside the earthen enclosures that once defined farmsteads across Munster. Without more specific documentation, it is difficult to say more about this particular example than that it exists, that it has been noted, and that the ground above it holds something worth knowing about.