The challenging entrance is a later addition, a Souterrain put in place some time in the Medieval era, complete with a lintel just inside the entrance with an Ogham Stone, inscribed with the words 'Fraoch, Son of Medb'. The built area forms a tight passage way.
Some way down, it opens into a much larger cavern, in both breadth and height.
The Pobal Mailing List is a good source for content and community interaction around this fascinating part of Irish History, Heritage and Spirituality.
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