CrosswordMint
Hidden Labyrinths and Subterranean Passages
Moderate difficulty suitable for most players
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Across
  • 1. Underground pipe system for waste disposal
  • 2. Underlying layer beneath surface material
  • 3. Underground conduit for transporting liquids
  • 4. Road or path passing beneath another structure
  • 7. Narrow excavation in the ground
  • 9. Urban underground railway system
  • 10. Fortified underground shelter
  • 13. Vertical tunnel for accessing mineral deposits
  • 15. Horizontal passage in a mine or tunnel system
Down
  • 5. Steep slope often near underground features
  • 6. Excavated passage through high ground
  • 8. Underground passage dug through earth or rock
  • 11. Process of drilling through earth or rock
  • 12. Long cliff or steep slope created by faulting
  • 14. To supply fresh air to tunnels or mines
  • 16. Ancient underground cemetery with tunnels
  • 17. Arched structure forming a ceiling or roof underground
  • 18. Simple underground toilet facility
  • 19. Curved structure over a tunnel entrance

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