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The world's largest tunnel boring machine (TBM) is the Herrenknecht S-317 (Shanghi) with a shield diameter of 15.43m. see the related links for more info (videos & photos & data) BUT there is some dispute: on the web there is this quote: The biggest ever built was used to excavate Gotthard Base Tunnel - 19 meters ... The Worlds Largest Hard-Rock Tunnel Boring Machine - STRABAG AG-. However, as of January, 2009, I am unable to find further info about this reference.
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