We (thanks to the diggers) managed to get an early visit there moons ago, when it was still going by the name Fester Hole. It was amazing to witness, all the more so because it was gobsmacking to "lift" the scenery and "relocate" it to the nearby Goatchurch Cavern/Sidcot Swallet caves as that's undoubtledly what they, too, would have looked like back in the earliest days of exploration, now largely smoothed into oblivion by literally hundreds of thousands of novices - provided such gems are actively and jealously guarded, they should withstand the rigours far better. Video wot we dun, yer: