While not of great speleological significance...[a]s an archaeological monument it forms part of a complex of 50 archaeological monuments that make up the ancient pre-Christian Connaught royal site of Cruachán. It is therefore of special importance as a cultural adaptation of a natural geological feature...Originally, an earthen mound surrounded the entrance but this was almost entirely removed in the 20th C. construction of the access laneway (Waddell, 1983). Thankfully, however, what is below ground is preserved in excellent condition. This consists of a double souterrain (which is closed-in on one side) leading, after 3m, to a natural cave. In the...