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 HerzogA fairly young, intelligent-looking man with long hair asked me whether filming or being filmed could do harm, whether it could destroy a person. In my heart the answer was yes, but I said no.
Werner HerzogAt the same time, there's something magnificent about volcanoes; they created the atmosphere that we need for breathing.
Werner Herzog