Maybe I should also re insert something about Konocti s notorious internal cavern It is one of the real mysteries about the mountain it s riddled with caves which have either collapsed or been filled in for safety reasons There is a serious ongoing attempt to excavate a tunnel and connect with the main magma chamber Supposedly it might be the largest vertical cavern on Earth although it is probably partly filled with water A lot of local people are convinced it existsit s just damned difficult to reach