At Shrone Beg in County Kerry, a souterrain, one of those narrow underground stone-lined passages built during the early medieval period, typically for storage or refuge, was recorded within the south-western quadrant of a rath, the type of circular earthwork enclosure that once served as a farmstead for an Irish family of some standing. By the time anyone thought to document it formally, there was nothing left to see above ground.

The sole evidence for this souterrain's existence comes from the 1894 Ordnance Survey six-inch map, which marks it within the enclosure now catalogued as KE068-020. That a cartographer noted it at all suggests it was at least partially visible in the late nineteenth century, but whatever remained has since been lost, obscured, or collapsed entirely. Whether the souterrain was ever fully excavated, or whether it simply deteriorated and vanished into the field, is not recorded. What survives is a cross-reference: a rath that can still be located, and a notation on an old map pointing to something underground that no longer announces itself.