That detail, passed down through the older men of nearby Bruff, suggests something deliberately constructed rather than a purely natural formation, though the cave itself has long since disappeared from easy view, surviving now only in the notes of an early twentieth-century antiquarian.

The account comes from Lynch, writing in 1913, who recorded what local people and landowners in the area could still recall or point out. A Mr. Kelly was able to identify the precise spot where the cave had been discovered, while Mr. Leahy Junior had heard from elderly Bruff men that the entrance was formed of cut stone, implying the feature was at some point modified or enclosed by human hands. Nearby, Lynch also noted a large conglomerate rock standing just outside Mr. Leahy's yard wall, which had reputedly served as a Mass Rock, one of the informal outdoor sites used by Catholic communities for worship during the Penal Laws, when public practice of the faith was suppressed. The cave sits approximately a hundred yards due east of a cromleac, the older Irish term for a megalithic tomb or dolmen, and close to two large flagstones that once formed part of an old gateway. The landscape around Grillagh, in other words, carried several layers of use and memory within a fairly compact area.

The cave's precise state today is unclear from the available record, and there is no guarantee that a visible opening remains. Anyone curious about the site would do well to use the cromleac (recorded as LI032-120) as a navigational anchor, since it lies roughly a hundred yards to the west and is itself a recorded monument. The two flagstones associated with the old gateway and the conglomerate Mass Rock may still be traceable in the field, and together they give some sense of how much historical incident can accumulate quietly in a single townland.