Two large flat slabs, each measuring somewhere between 1.3 and 1.7 metres, lie displaced against a nearby field fence; they are thought to be roof lintels, the stones that once formed the ceiling of the passage below, now tipped out of position and left where they fell.

A souterrain is a man-made underground structure, typically built during the early medieval period in Ireland, consisting of one or more stone-lined passages or chambers. They are found in close association with settlements and enclosures, and their exact purpose is still debated, though storage and refuge are the most commonly suggested uses. The Carrowcor example fits this pattern neatly: the passage is understood to extend northward from its blocked access point toward an enclosure roughly 45 metres away, suggesting the two features were once part of the same settlement complex. The depression visible at the surface measures only about 1.5 metres by 1 metre, a modest trace of something that presumably extends considerably further underground.

What survives above ground here is not much to look at in isolation: a slight hollow, some stones in the turf, and a pair of large slabs propped against a fence line. But that modesty is part of what makes it worth attention. The relationship between the blocked hole, the displaced lintels, and the enclosure to the north sketches out, in a quiet field in Mayo, the faint outline of a place where people once lived and apparently felt the need to build themselves a way underground.