¹⁰O'Looney, Brian. "On Ancient Historic Tales in the Irish Language (XXXVI)." Proceedings of the Royal Irish Academy Polite Literature and Antiquities 1 (1879): 222-23.
The souterrain at Rathcroghan is also known as the "Cave of the Cats," or "Ireland's Hell-Gate." In "The Cave of Ainged," after Nera entered the cave he was taken prisoner by the fairies, put to work, and compelled to marry one of their women. He finally managed to escape, and returned to the king with much information regarding the cave and its contents, enabling the army to break into the treasure house of the sídh and carry off great treasure. This tale may be read in its entirety here.