How Are These Fires Burning Underground

Directed by Ivana Bošnjak Volda

In 1997, a fire began in Indonesia that would rage for almost a year. Despite being one of the largest fires in recorded history, for months at a time it burned without a flame. This might sound like a uniquely freaky fire, but it’s actually one of many. So, is it possible to snuff out these bizarre blazes? And how do they form in the first place?