A huge underground explosion blamed on methane gas killed 25 miners in the worst U.S. coal mining disaster since 1984, and rescuers on Tuesday began a dangerous and possibly futile attempt to rescue four others still missing. Crews were bulldozing an access road so they could drill 1,000 feet into the earth to release gases and make it safe to try to find the missing miners. They were feared dead after the Monday afternoon blast at a mine with a history of violations for not properly ventilating highly combustible methane.Rescuers were being held back by poison gases that accumulated near the blast site, about 1.5 miles from the entrance to Massey Energy Co.’s sprawling Upper Big Branch mine. Read more on Yahoo News

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