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A tunnel boring machine used to excavate the Gotthard Base Tunnel, the world's longest rail tunnel. A tunnel boring machine that was used at Yucca Mountain nuclear waste repository A tunnel boring machine ( TBM ), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata .

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A tunnel boring machine used to excavate the Gotthard Base Tunnel, the world's longest rail tunnel. A tunnel boring machine that was used at Yucca Mountain nuclear waste repository A tunnel boring machine ( TBM ), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata .

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A tunnel boring machine used to excavate the Gotthard Base Tunnel, the world's longest rail tunnel. A tunnel boring machine that was used at Yucca Mountain nuclear waste repository A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.

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A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They may also be used for microtunneling. They can bore through anything from hard rock to sand. Tunnel diameters can range from a ...

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A tunnel boring machine (TBM) is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.They can bore through hard rock, sand, and almost anything in between.Tunnel diameters can range from a metre (done with micro-TBMs) to almost 16 metres to date. Tunnels of less than a metre or so in diameter are typically done using trenchless ...