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19 May - 11:43 pm NZ
Updated at 9:24 am on 3 December 2010
The unit working at making the Pike River coal mine safe to retrieve the bodies of the 29 men who died there, was operating through the night.
A modified jet engine, called a 'gag' unit, is pumping carbon dioxide into the mine to cool it and neutralise the gases inside.
Pike River Coal chairman John Dow says the unit was off for three hours on Thursday, but has been operating since 6pm.
He told Morning Report it could take several days to evaluate the success of the unit.
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