Moderate difficulty suitable for most players
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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