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  2. Underdark - Wikipedia

    en.wikipedia.org/wiki/Underdark

    The Underdark featured prominently in the campaign settings World of Greyhawk [2] and the Forgotten Realms. [3] The concept of a dungeon that spanned a planet was first introduced by Gary Gygax in his D-series of game modules [4] and at the end of the G-series.

  3. List of tunnels by country - Wikipedia

    en.wikipedia.org/wiki/List_of_tunnels_by_country

    Artemisio Tunnel (road), double tunnel, under Mount Artemision, 1.40 km 76 tunnels of the A2 motorway (Egnatia Odos), most notably in parts of Epirus and Western Macedonia , combined length of 99 km, the longest of which are Driskos Tunnel 4.6 km, Metsovo Tunnel 3.5 km, Dodoni Tunnel 3.6 km, Kastania Tunnel 2.2 km, Anilio Tunnel 2.1 km

  4. List of longest tunnels - Wikipedia

    en.wikipedia.org/wiki/List_of_longest_tunnels

    Will be the longest road tunnel in the world, and also the deepest undersea tunnel, 392 metres (1,286 ft) below sea level. It will also have a 4,100 m (2.548 mi) connection tunnel from Kvitsøy to the main tunnel. Railway Sasson Tunnel [citation needed] Hokkaido, Japan 26,230 m (16.299 mi) [citation needed] 2031 Part of the Hokkaido Shinkansen.

  5. List of longest road tunnels - Wikipedia

    en.wikipedia.org/wiki/List_of_longest_road_tunnels

    Daiyunshan Tunnel China 5.850 km (3.6 mi) [dj] 2017 2 G2517 Shaxian-Xiamen Expressway: Lianghekou Tunnel China 5.840 km (3.629 mi) 2010 1 Lianghekou Hydroelectricity Power Station Road Shixia Tunnel China 5.833 km (3.6 mi) [dk] 2018 2 S3801 Beijing-Chongli Expressway Jiangjunshi Tunnel China (Sichuan-Gansu)

  6. World’s longest road and rail tunnel is being built under the ...

    www.aol.com/news/world-longest-road-rail-tunnel...

    The tunnel, which will be 18 kilometers (11.1 miles) long, is one of Europe’s largest infrastructure projects, with a construction budget of over 7 billion euros ($7.1 billion).

  7. Lists of tunnels - Wikipedia

    en.wikipedia.org/wiki/Lists_of_tunnels

    The following articles contain lists of tunnels: List of tunnels by location; List of longest tunnels; List of long tunnels by type;

  8. Secret World War II tunnels to open to public - AOL

    www.aol.com/news/secret-world-war-ii-tunnels...

    Plans have been revealed for what promises to be London’s most spectacular underground tourist attraction ever: a $268 million transformation of a mile-long series of World War II tunnels into a ...

  9. List of longest railway tunnels - Wikipedia

    en.wikipedia.org/.../List_of_longest_railway_tunnels

    Hiyoshi Tunnel [71] Japan 14.532 km (9.0 mi) 2027 Chūō Shinkansen Linjiashan Tunnel China 14.530 km (9.029 mi) 2026 Xi'an-Ankang HSR: Yujialiang Tunnel Shaanxi: 14.504 km (9.012 mi) 2028 Chongqing-Xi'an High Speed Railway: Nanjing South Station Tunnel China 14.442 km (8.974 mi) 2026 Nanjing-Wuhu Railway