GREYMOUTH, NEW ZEALAND - NOVEMBER 19: An aerial view of the Pike River Coal Mine show light smoke rising following a methane gas explosion on November 19, 2010 in Greymouth, New Zealand.  29 miners are missing following a blast on November 19 at the mine 50 kilometers north of Greymouth on New Zealand's west coast. Specialist safety rescue crews are on standby until air and gas levels are cleared as safe for the rescue operation to commence. (Photo by Greymouth Star/Getty Images)