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Police say there has been a second blast inside the New Zealand mine where 29 workers are missing and that no one could have survived.
Police superintendent Gary Knowles said the second explosion occurred Wednesday afternoon.
Potentially explosive methane gas had been swirling in the Pike River mine since the initial blast last Friday.
A drilling team on Wednesday broke a narrow shaft through to the section of a New Zealand coal mine where 29 workers have been missing for almost six days, and was greeted by a blast of potentially deadly gases from inside.
Nothing has been heard from the missing miners since the blast. Toxic and potentially explosive gases have kept rescuers from entering the mine, though an army bomb disposal robot crawled two-thirds of a mile (1 kilometer) into the tunnel on Wednesday and found a miner's helmet with its fixed light still glowing.
Hot air and gas rushed the hole when the chamber roof was punctured, and Pike River Coal Ltd. chief Peter Whittall said initial tests showed it was "extremely high in carbon monoxide, very high in methane and fairly low in oxygen." Carbon monoxide - the polluting gas from car exhausts - is extremely poisonous, while explosive methane is the gas believed to have ignited in Friday's blast.
R.I.P