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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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