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A tunnel boring machine used to excavate the Gotthard Base Tunnel (Switzerland), the world's longest rail tunnel. by James Henry Greathead (6 August 1844 – 21 October 1896)] was a civil engineer renowned for his work on the London Underground railway.  https://en.wikipedia.org/wiki/James_Henry_Greathead

A tunnel boring machine used to excavate the Gotthard Base Tunnel (Switzerland), the world's longest rail tunnel. by James Henry Greathead (6 August 1844 – 21 October 1896)] was a civil engineer renowned for his work on the London Underground railway. https://en.wikipedia.org/wiki/James_Henry_Greathead

Saint Gotthard Rail Tunnel ~  an astonishing nine miles long, dug under the Alps between 1871 and 1881 at the cost of at least 200 worker’s lives.

Saint Gotthard Rail Tunnel ~ an astonishing nine miles long, dug under the Alps between 1871 and 1881 at the cost of at least 200 worker’s lives.

A tunnel boring machine that was used at Yucca Mountain nuclear waste repository

A tunnel boring machine that was used at Yucca Mountain nuclear waste repository

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