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    Tunnel Boring Machine

    Object » linked to 1 games

    A cylindrical machine used to carve tunnels through rock and soil. Some are extremely large and are operated by a team of workers from the inside.

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    Overview

    Real World

    The largest TBM ever made, nicknamed "Bertha", was custom-built by Hitachi Zosen for the construction of a 1.7-mile tunnel underneath Seattle, Washington. It measures 57.5 ft across and 326 ft in length, weighing over 7000 tons.

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