CHARLESTON, W.Va. (WKOW) -- Exploratory teams have entered West Virginia coal mine where 29 men died in the April 5th explosion.
Mine Safety and Health Administration spokeswoman Amy Louviere says the trip inside Massey Energy's Upper Big Branch mine started Monday morning. Teams are making their way through the mine to make sure it's safe for investigators to begin searching for the cause of the industry's worst disaster in 40 years.
Teams re-entered the mine June 2nd for the first time since rescuers removed the bodies in April. They retreated briefly after elevated levels of toxic carbon monoxide and explosive methane gas were registered, but returned hours later to connect phone line between the mine's entries.
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