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  1. Tunnel - Wikipedia

    A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals …

  2. Tunnel construction - Wikipedia

    Tunnels are dug in types of materials varying from soft clay to hard rock.

  3. TunnelBear: Secure VPN Service

    Discover something new, or tunnel back home to enjoy your favourite websites and apps while travelling or living abroad.

  4. tunnels and underground excavations - Encyclopedia Britannica

    tunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by nature’s action in dissolving a soluble rock, such as limestone. A …

  5. TUNNEL Definition & Meaning - Merriam-Webster

    The meaning of TUNNEL is a covered passageway; specifically : a horizontal passageway through or under an obstruction. How to use tunnel in a sentence.

  6. How Tunnels Work - HowStuffWorks

    In this article, we'll explore what makes tunnels such an attractive solution for railways, roadways, public utilities and telecommunications. We'll look at the defining characteristics of tunnels and …

  7. TUNNEL | English meaning - Cambridge Dictionary

    TUNNEL definition: 1. a long passage under or through the ground, especially one made by people: 2. the long passage…. Learn more.

  8. Is the Tunnel Log Drive Through in Sequoia National Park Worth it?

    1 day ago · Tunnel Log is a spot in Sequoia National Park which is open to the public, however, not all vehicles can drive through the Tunnel Log. It can accommodate vehicles that are less …

  9. 22 Types of Tunnels - Uses, Advantages ... - Engineering Learn

    Tunnels are counterfeit submerged burrows that are worked without harming the outer layer of the earth. The passages are submerged paths utilized for the most part for transport purposes. …

  10. Tunneling - Geoengineer.org

    A tunnel is an underground structure which is constructed through the surrounding mass of soil or rock. Typically, a tunnel’s length is much greater than its width. Tunnels are designed to …