Fleeting interval to endeavour Pike mine rescue.

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   The first four hours after Friday's Pike River detonation was the only time rescuers could have moved into the mine, a protection experts said. After that fleeting time span the 2.8km tunnel network became a ticking bomb as it refilled with potentially explosive methane, said earlier mine complete overseer John Brady, any person who has studied 20 incurable mine incidents in Australia. Mr. Brady said investigations of mining incidents indicated that a brief window of opportunity arose after an underground gas explosion, when dangerous gases had burned away.

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