You can't have a helicopter fly over boiling lava. It would've exploded from the heat, and is just way too dangerous. The pilot of a helicopter would've flatly refused anyway.
Werner HerzogIt's funny how in the long time of me working in various countries and various situations that there is this kind of idea out in the media that I am a daredevil and that I risk the lives of everyone around me, but nobody ever gets hurt on my shoot. Some crew members sometimes, but the actors are OK.
Werner Herzog