"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
You can't be afraid to put out a fire if you're a fireman. You can't be afraid to be a police officer and carry a gun if you're afraid to get up and go out there. So you've got to put that fear to the side and go out in faith to overcome that.