The Nyoongar people believed that the Waugal, the Nyoongar name for the rainbow serpant, entered the limestone cliffs here at the cave to sleep after having created a large flood that submerged the land between Rottnest Island and the coast.
The cave is off limits to pedestrian traffic due to the damage that is being created, please respect this. You can see a good vantage point at the information sign.
You are looking for a small Sistema container inserted into a crevice in the cliff face, and hidden behind some rocks.
GZ is accessible via the beach which might require a little low wading at high tide but you can keep your feet dry during low tide.