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  1. Tunnel - Wikipedia

  2. A $20 trillion tunnel that could link New York and London in an …

  3. Tunnel Definition & Meaning - Merriam-Webster

  4. tunnels and underground excavations - Encyclopedia Britannica

  5. How Tunnels Work - HowStuffWorks

  6. Tunnel construction - Wikipedia

  7. TUNNEL | English meaning - Cambridge Dictionary

  8. Tunnels and underground excavations - Tunneling techniques

  9. tunnel summary | Britannica

  10. Tunnels: Essential Structures in Transportation Infrastructure ...