Cave details
Britain's third longest cave as well as being its deepest at 308 m deep. The trip from the top entrance to the bottom entrance is the deepest cave through trip in Britain at 228 m. The cave is formed on several levels with in general large breakdown passages at the upper level and a streamway at the bottom level which occasionally becomes a sump level. Passages connecting the levels generally descend steeply and almost all are rift controlled. The cave is decorated throughout with many different styles of calcite decorations of which the most well known are The (~2m high) Columns, with The Trident being the longest stalactite in the UK at 5 metres (there is a longer stalactite in Pol-An-Ionain in the Republic of Ireland). The cave has five entrances allowing for several through trips. Entry is controlled by the South Wales Caving Club and if there is a description for this cave, there's no way it could describe everything, it's far too complicated. There is a virtual guide through a few of the more popular routes.