00:00At night, this volcano burns electric blue.
00:02By sunrise, the crater reveals something just as strange, a turquoise lake filled with acid.
00:08This is Kawa Ijen in East Java, Indonesia.
00:12Deep inside the crater, sulfur-rich gases escape through cracks at extremely high temperatures.
00:18When the gases meet oxygen, they ignite, creating the electric blue flames seen across the crater at night.
00:25Some of the sulfur condenses into liquid, flows briefly across the rocks while burning, then cools into thick yellow deposits.
00:33The turquoise water inside the crater is one of the world's largest highly acidic crater lakes.
00:39Its color comes from dissolved volcanic chemicals and minerals in the water.
00:44The crater also releases hazardous gases, and when the wind shifts, the air can become dangerous to breathe very quickly.
00:51Even so, sulfur miners still descend into the crater, extract solid sulfur, and carry heavy loads back up the steep
00:59slopes.
01:00Kawa Ijen looks impossible.
01:02Blue fire at night, an acid lake by day, and people working inside an active volcanic crater.
01:08What makes this place beautiful is exactly what makes it so dangerous.
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