In 2004 we checked out this huge cave in Sligo, it's near Aughrish Head, I can't remember exactly where but could probably figure it out. The cave was huge, I think you could fit a few double decker buses in it but it was soaking wet. It was clear though that the rock was incredible smooth and rounded limestone, the walls where step banded with slopey breaks. If (and it's a big if) it ever dried it would be amazing, probably bigger than Gravity with beautiful rock and a perfect sandy landing. Photos are Kev Cooper's.