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Labyrinthine Vaults of Subterranean Engineering
Challenging puzzle for experienced crossword solvers
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Across
  • 1. A lattice-like pattern critical for structural tunnel reinforcement
  • 2. A tunneling method employing rock mass as structural support (abbr.)
  • 3. Safety link between parallel tunnels for emergency evacuation
  • 4. Horizontal mining entrance or tunnel, often unassuming
  • 8. Rarely used term for reducing earth pressure around tunnels
  • 11. Machine crucial for air circulation in mining or subway systems
  • 12. A projecting beam used in tunnel framework without external bracing
  • 15. Temporary support method preventing underground collapses
  • 18. Lowest floor of a tunnel channel, essential for drainage
  • 20. Layers of earth or rock beneath the surface, often tunneled
Down
  • 5. High-tech device carving subterranean paths with precision
  • 6. Describes a network of hollow, underground chambers, vast and imposing
  • 7. Driving deep foundations often assisting tunnel segment support
  • 9. Ice masses slowly carving subglacial passageways
  • 10. Spacious underground hall connecting different transit tunnels
  • 13. Process separating soil particles in tunnel bore stability
  • 14. Curved support structures distributing tunnel loads
  • 16. The act of boring passageways beneath the earth’s crust
  • 17. Measure of void spaces affecting groundwater flow near tunnels
  • 19. Material embedded in joints to prevent seepage under tunnels

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