CrosswordMint
Secrets Beneath: Global Tunnel Networks
Moderate difficulty suitable for most players
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Across
  • 1. A reinforced underground shelter used for protection.
  • 2. An underground urban railway system for public transport.
  • 4. A vertical or near-vertical tunnel used for access in mining.
  • 7. An adventurous outing or underground route, sometimes used metaphorically.
  • 9. A passage or tube for air, cables, or fluids in tunnels.
  • 10. The process of digging tunnels through the earth or rock.
  • 13. A passage dug underground for transportation or utilities.
Down
  • 3. A conduit for carrying off drainage or waste underground.
  • 5. A road or pedestrian crossing beneath another roadway or railway.
  • 6. Codes sometimes hidden in secret underground networks (figurative).
  • 8. An underground cemetery consisting of subterranean passageways.
  • 11. A channel for conveying water or other fluid underground.
  • 12. A water-bearing underground layer of permeable rock or sediment.
  • 14. A horizontal passage in a mine or tunnel system.
  • 15. Extraction of minerals or other geological materials from beneath the surface.

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