Deep Underground, Miles of Hidden Wildfires Rage - TIME

As far as 90 feet underground and 100 feet thick, miles of coal seams are continually burning in the U.S. and elsewhere, releasing toxic fumes that funnel up to the surface

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Earth:Coal - HandWiki

Coal-seam fire - Wikipedia

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Notes From the Underground: The Long History of Tunnel Warfare

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Hell on Earth': The First 12 Hours of California's Deadliest Wildfire - The New York Times

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The Ally From Hell - The Atlantic

Spontaneous combustion of coal seams in the Bengiler coal mine in Turkey