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Subterranean Engineering and Labyrinths is a hard crossword puzzle with 7 clues covering . Play it online for free below, or create your own crossword with our free crossword maker.

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Subterranean Engineering and Labyrinths
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Zone of aeration above the water table in underground passages
  • 3. Injection process to strengthen soil or rock around a tunnel face
  • 4. Layer beneath earth’s crust, often tunneled through in geology
  • 6. Structural protective layer applied inside tunnels for durability and safety
Down
  • 2. Secret illicit tunnel, often historically used for smuggling or underground escape
  • 5. Civil method of shallow tunnel construction involving excavation and restoration
  • 7. Inverted U-shaped conduit allowing flow beneath obstacles within tunnel hydraulics
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