Two men died due to an exploding manhole cover in Wuyuan county,Bayannur city of Inner Mongolia Autonomous Region recently. Both men were cleaners of a housing estate. The explosion occurred when they tried to thaw out a frozen manhole cover by lightning it on fire. Methane gas inside the manhole exploded instantly and they died at the scene. Experts say the frozen manhole can be thawed by hot water quite simply but it is extremely dangerous to light it on fire.
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