Pitch 1 - Rat Hole
Approaching the short first pitch, there is an inconspicuous drilled thread high up on the left. An unused bolt in the roof is followed by a single bolt hang on the far wall of the pot which requires 2 maillons.
Pitch 2 - Traverse Pitch
From the base of the first pitch, a rift leads past two traverse bolts on the right wall, to overlook the Rat Hole waterfall. Here good footholds allow a Y-hang on the right to be rigged. Then, almost immediately, a deviation on the left and a short descent means one can swing east away from the water. This gains the narrowest part of a bottomless rift, where there are footholds and a bolt in the south wall. Heading on into the rift, it is easiest to clip the chest jammer onto the hanging rope and swing across to a good ledge with bolt. This dry ledge has room for a couple of people, and a metre or so further, on the north wall, is the Y-hang for Mousehole Shaft.
Pitch 3 - Mousehole Shaft
The next section descends Mousehole Shaft to The Amphitheatre (or 'Wet Ledge') where some spray will be met. There are deviations on the south wall at 25 m and 35 m (ignore the one at -10 m). Once in The Amphitheatre, there is a bolt for a bottom belay at eye level on the south wall. Turning left under a big chockstone, a short traverse on good footholds leads past one bolt on the right to a second, which is the belay for the last pitch. There is room for a number of people in this area, but it is a bit damp for comfort.
Pitch 4 - Main Chamber
The final pitch drops past a deviation on the north wall at 5 m, to land on a rock bridge. A deviation on the south wall then allows a clean drop to the floor of Main Chamber, where some spray will be met.
Rope: 35 m, 60 m, 40 m.
Karabiners: 5 (for deviations)
Deviation slings should be in place.