America’s secret machine! They drill the mountain in one day
Any list of distinct metropolitan skylines would have to include Seattle, dominated by its Space Needle. But it’s what’s going on below ground that is making news there. Now, following the retirement of Bertha, once the largest tunnel boring machine ever built, the United States quietly embarked on the development of an even more colossal TBM. This new machine was designed to construct a groundbreaking transportation project kept under wraps from the global press. Locals witnessed only dust clouds and heard loud machinery noises above ground. Credit to : The Fancy Banana
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