What makes the site at Liscune particularly interesting is not just the rath itself, but what may lie beneath it: a rectangular depression in the south-west quadrant of the enclosure's interior hints at a souterrain, an underground stone-lined passage or chamber typically built during the early medieval period to serve as storage space, a place of refuge, or both.

The rath, measuring 38 metres in diameter, belongs to a class of monument that was once extraordinarily common across Ireland. These circular enclosures, defined by raised earthen banks and ditches, were the farmsteads of early medieval Ireland, occupied roughly between the fifth and twelfth centuries. Most housed a single family and their livestock, the banks offering a degree of protection and a clear statement of ownership. At Liscune, the enclosure retains two banks separated by an intervening fosse, a form that suggests either higher status or simply a builder with particular thoroughness. A field wall has been built over the outer bank at some point, folding the monument quietly into later agricultural use, though a gap on the south-east side may represent the original entrance. The interior hollow, running north to south and measuring 13 metres long and just under 3 metres wide, has the proportions consistent with a souterrain, though whether it conceals a roofed passage or simply a collapsed feature has not been confirmed.