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BANYUWANGI, EAST JAVA - DECEMBER 17: A miner carries sulfur during an annual offering ceremony on the Ijen volcano on December 17, 2013 in Banyuwangi, Indonesia. The ritual is performed by the sulfur miners of Mount Ijen who slaughter a goat and then bury the head in the crater of mount Ijenn. The sacrifice is performed to ward off potential disasters for the next year. The Ijen crater rises to 2,386m, with a depth of over 175m, making it one of the world's largest craters. Sulphur mining is a major industry in the region, made possible by an active vent at the edge of a lake, but the work is not without risks as the acidity of the water in the crater is high enough to dissolve clothing and cause breathing problems. (Photo by Ulet Ifansasti/Getty Images)
BANYUWANGI, EAST JAVA - DECEMBER 17: A miner carries sulfur during an annual offering ceremony on the Ijen volcano on December 17, 2013 in Banyuwangi, Indonesia. The ritual is performed by the sulfur miners of Mount Ijen who slaughter a goat and then bury the head in the crater of mount Ijenn. The sacrifice is performed to ward off potential disasters for the next year. The Ijen crater rises to 2,386m, with a depth of over 175m, making it one of the world's largest craters. Sulphur mining is a major industry in the region, made possible by an active vent at the edge of a lake, but the work is not without risks as the acidity of the water in the crater is high enough to dissolve clothing and cause breathing problems. (Photo by Ulet Ifansasti/Getty Images)

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These men work in a volcano

Mount Ijen, Indonesia

Updated 1719 GMT (0119 HKT) September 25, 2017

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    Mount Ijen, Indonesia (CNN)See what it's like to have one of the toughest jobs in the world: mining sulfur in at an active volcano in Indonesia, amid plumes of poisonous gas.