This is the only remaining cache in the Mercury's Island series! There are now 3 steps to this multi-cache, so stick with it. Also, there is a PHYSICAL CACHE at each point of the multi. You cannot progress until you find the physical cache! Good hunting!
1fg Fgntr: Fbzrguvat ybbxf bhg bs cynpr urer.
2aq Fgntr: Zvpeb, Nybat gur jnyy.
Svany fgntrf : Zrephel ybirf gerrf!