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Topic: hyperbaric

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January 14, 2014 at 7:48 PM

Highway 99 tunnel team “going hyperbaric” to inspect Bertha

After drilling four deep shafts and sending a man down to look last week, Seattle Tunnel Partners and the state Department of Transportation don’t fully know yet what’s blocking tunnel machine Bertha, some 60 feet deep next to Pioneer Square. So the DOT announced Tuesday it is “going hyperbaric,” by sending workers to the pressurized…

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