A small limestone cave on a west-facing slope in County Waterford conceals a deceptively modest archaeology. You reach its interior through a narrow passage roughly twelve metres long, which opens into a chamber of only about five metres by three, yet what was found inside complicates any assumption that this was simply a natural hollow in the rock. Bones of fowl and rabbit were recovered alongside pottery that may date to the medieval period, suggesting the cave was used by people, not merely by animals seeking shelter.

The investigation took place in 1906 and was documented by G. W. Forsayeth, who published findings on cave exploration in Waterford in 1909. The cave sits on the Bridgequarter townland and is known locally as Ooanagoloor, a name whose pronunciation and spelling have drifted across records over the years. Roughly seventy metres to the south-west lies the first entrance to a separate feature known as Brothers' Cave, and while the two systems may connect underground, that connection was never re-opened during excavation. The original field notebooks from the 1906 investigation were lost for a period and only recovered in the early 2000s, when Corlett and Dowd drew attention to them in a 2002 article on subterranean Waterford. Their recovery means that the ceramic and bone finds may yet yield more precise interpretations than have previously been possible, since the published accounts left a number of questions about context and date open.