Hi Philip . On checking the VTC chart for the Gold Coast it appears that the base of controlled airspace in the area of concern is 1500’, below this it is Class G airspace and is as a consequence outside of controlled airspace ( OCTR ) . There is no clearance required to fly in Class G airspace , that may or may not be a contributing factor . There is also a CTAF radio frequency for Sea World operations , was it being used or monitored ? . All no doubt will be revealed in due course , however , irrespective of any findings it a tragedy that should not have happened .
Dave C
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