Still burning deep below the surface at the site of the World Trade Center is the longest burning commercial fire in U.S. history. [Link corrected]
"As in a stubborn coal mine fire, the combustion taking place deep below the surface is in many places not a fire at all. Instead, oxygen is charring the surfaces of buried fuels in a slow burn more akin to what is seen in the glowing coals of a raked-over campfire. But the scale of the trade center burning is vast, with thousands of plastic computers, acres of flammable carpet, tons of office furniture and steel and reservoirs of hydraulic oil and other fuels piled upon one another."
Thanks to Abhijeet Chavan
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