Ive been searching for three days now and still no luck. I digged holes on every isle, three screens in every direction from the middle, but... no luck. But if I cant finish it, I will never meet Zeus. Thats kinda bad -_- ... not the first quest which does not work for me. edit : oh-my-gosh...
Dreamys tip worked, I finally (!!!!) found it after three hours of searching. It was on Bones. But In a place I would not have searched without Dreamys tip !!! MANY thanks for that 