About: Tunnel hole-through

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Tunnel hole-through, also called breakthrough, is the time, during the construction of a tunnel built from both ends, when the ends meet, and the accuracy of the survey work becomes evident. Many tunnels report breakthroughs with an error of only a few inches, for example: * the 1858 Blue Ridge Tunnel – 6 inches (150 mm) * the 1944 Blue Ridge Tunnel replacement – 4 feet (1.2 m) - 1944 * the Lötschberg Base Tunnel – 10 cm * the Holland Tunnel - 1 cm

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  • Tunnel hole-through, also called breakthrough, is the time, during the construction of a tunnel built from both ends, when the ends meet, and the accuracy of the survey work becomes evident. Many tunnels report breakthroughs with an error of only a few inches, for example: * the 1858 Blue Ridge Tunnel – 6 inches (150 mm) * the 1944 Blue Ridge Tunnel replacement – 4 feet (1.2 m) - 1944 * the Lötschberg Base Tunnel – 10 cm * the Holland Tunnel - 1 cm (en)
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  • Tunnel hole-through, also called breakthrough, is the time, during the construction of a tunnel built from both ends, when the ends meet, and the accuracy of the survey work becomes evident. Many tunnels report breakthroughs with an error of only a few inches, for example: * the 1858 Blue Ridge Tunnel – 6 inches (150 mm) * the 1944 Blue Ridge Tunnel replacement – 4 feet (1.2 m) - 1944 * the Lötschberg Base Tunnel – 10 cm * the Holland Tunnel - 1 cm (en)
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  • Tunnel hole-through (en)
  • Genomslag (sv)
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