Park at end of Trevors Lane and follow the firetrail to Refuge Rock. Once at the rock continue towards the coordinates at the far end. You can't go straight off the edge and will need to work your way around by going left near the end of Refuge Rock. The last crevice then takes you back under the bridge.
Watch out for Bunyips, Drop Bears and Leeches (and some big ants). Also be mindful of the cliff edges with geokids, but it is quite safe for them if you are careful.
Cache is about a 30min walk from the road.
One litre container with some swaps.