We're getting a better look at the steel pipe that's apparently blocking the world's largest tunneling machine under Seattle.

Washington Department of Transportation released photos of the effort to clear the path of Bertha, the boring machine that's drilling the State Route 99 tunnel.

WSDOT says 57 feet of the 8-inch diameter pipe was pulled from the ground after Bertha struck it in early December, halting it.

The photos also showed a couple of boulders - about two feet in diameter - and a flattened pipe that have been removed by Bertha.

WSDOT crews are drilling a new 5-foot diameter shaft in front of Bertha to extract any other debris which might be blocking the machine. Crews are also continuing to gather additional information on any other factors that might be blocking Bertha.

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