60m. S1. DWS traverse of the Underworld cave. Down climb/abseil down an easy corner on SE side of the cave. Traverse leftwards and gradually upwards on the lip of a vertical, bottomless, wall. This soon becomes steeper as you get towards the centre of the cave and the apex of the arch below your feet. At the apex is the crux, from here you can traverse more easily downwards and leftwards past Underworld to a sitdown cave. Finally drop round to another wall which can be traversed leftwards to reach the west edge of the cave. Go upwards here.