Meet Bertha, the world's largest-diameter tunnel boring machine. Bertha was built in Japan and reassembled in the U.S. The machine has its own electric power source, so its 25,000-horsepower engine won't disrupt the local grid.
Tuesday, 12 November 2013
The World's Largest Tunnel-Boring Machine
Meet Bertha, the world's largest-diameter tunnel boring machine. Bertha was built in Japan and reassembled in the U.S. The machine has its own electric power source, so its 25,000-horsepower engine won't disrupt the local grid.
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