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In page Haroun Tazieff:
"The National Geographic film The Violent Earth was based on Tazieff's expeditions to the volcanoes, Mount Etna, Sicily in 1971 and Mount Nyiragongo, Democratic Republic of Congo in 1972 in which he attempted, unsuccessfully, to descend into the active lava lake in order to collect samples something he had managed to achieve on a previous expedition in 1959.
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