Moderate difficulty suitable for most players
Esoteric Passageways Beneath Earth
Challenging puzzle for experienced crossword solvers
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Across
- 1. Mining term for nearly horizontal entrance to a mine
- 2. Urban subterranean railway for rapid transit
- 3. Underlying layer beneath earth’s surface, foundation for tunnels
- 6. Rare term for entwined subterranean fissures (wordplay: splits + ethereal zones)
- 7. Describes vast, hollow underground chambers often in limestone
- 8. Ancient underground cemeteries lined with labyrinthine galleries
- 9. Relating to processes accelerating underground chemical changes
- 12. Vertical or inclined drilled opening, often for exploration or ventilation
- 14. Man-made conduit bored through earth or rock, hidden route
- 16. Vertical or inclined passage connecting surface to underground
Down
- 4. Channels conveying air or water underground, often engineered
- 5. Zone above groundwater table where air and water coexist
- 10. Steep slope marking geological boundary often with cave entry
- 11. Mining gallery driven horizontally for resource extraction
- 13. Science of measurement critical in subterranean construction
- 15. Process eroding subterranean channels in karst landscapes
- 17. Mining passage, often horizontal, carved beneath the surface
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