[img]http://d.yimg.com/a/p/ap/20100406/capt.d44a3ee7ca2043e8bfdcedb3ccfd2c1d-d44a3ee7ca2043e8bfdcedb3ccfd2c1d-0.jpg?x=87&y=130&q=85&sig=2huuZSaWvxtTjVGjNk.8dA--[/img]AP - Crews were drilling early Wednesday to ventilate toxic gas from a West Virginia coal mine shattered by a deadly explosion, trying to make a section of it safe enough for rescuers to search for four missing miners as hope for their survival grew dim.