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Seattle’s Big Bertha Tunnel Drill Blocked

There is mystery surrounding a major work in progress – a tunnel that has literally struck a snag of unknown origins.They call this tunnel machine – Bertha, a 57-foot-wide, earth-eating tunnel maker tearing away dirt and debris below downtown Seattle to make way for an underground highway along the city’s waterfront.

The contractors responsible for drilling that tunnel under downtown Seattle say so much groundwater is flowing into the tunnel it will take another few weeks before they can look at what’s blocking Bertha.

Chris Dixon of Seattle Tunnel Partners told The Seattle Times that a sealed-off chamber is almost full of water, even though six wells have been dug to try to pump water away from the machine.

Seattle's Big Bertha tunnel drill blocked

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