A souterrain is an artificial underground passage or chamber, typically dry-stone lined or, as here, cut directly from the earth, and associated with early medieval settlement in Ireland, where such structures were likely used for storage, refuge, or both. What makes the Inchincurka example quietly notable is not its size but its geometry: three subrectangular rooms, each with a barrel-vaulted ceiling, all orientated along the same northeast-southwest axis, carved into the ground with a consistency that suggests deliberate design rather than opportunistic digging.

The site came to light in 1956 and was investigated by E. Fahy, who recorded the three chambers in detail. The first is modest almost to the point of being a crawl space, measuring just half a metre in length, one metre wide, and less than a metre high. The second and third chambers are considerably larger, each running to one and three-quarter metres in length and one and a quarter metres in width, though no ceiling height was recorded for either. Fahy noted that the structure may extend further than the three chambers he was able to examine, raising the possibility that additional rooms remain undocumented beneath the pasture. The site is recorded in McCarthy's 1977 survey of the area, which places it within the broader corpus of West Cork's underground archaeology.

The souterrain is currently inaccessible, so there is no question of entering or closely inspecting it. It sits in farmland, and its presence is more a matter of what lies underfoot than anything visible at the surface. That unresolved quality, the suggestion of more chambers beyond what was mapped, gives it a particular kind of interest for anyone following the distribution of these structures across the Cork landscape.