What is the longest tunnel dug by hand?

The historical Burro Schmidt Tunnel is located in the El Paso Mountains of the northern Mojave Desert, in eastern Kern County, southern California. NRHP reference No. It is a 0.5-mile (0.80 km) mining tunnel dug with hand tools and dynamite over a 38-year period by William Burro H. Schmidt (1871–1954).



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The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.

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Being 25 km long the Laerdal Tunnel i Norway is the world's longest road tunnel - and it is equipped with support and cable ladders from Oglaend System. To ease the drive through the 25 km long tunnel, there is a huge hall every 6 km.

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Because we dig while reinforcing them. Once a tunnel is dug, the walls are sprayed with concrete and immediately hardened. Also, steel frames called steel support and steel rods called rock bolts are used to reinforce the tunnel so that it can be dug without collapsing.

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Roughly in chronological order, they are as follows:
  • The Euphrates Tunnel (circa. 2180 to 2160 BC, a little less than 1 km long). ...
  • The Etruscan tunnel at the Furlo pass (circa. 450 BC, length unknown, but probably less than 40 metres). ...
  • Grotta di Cocceio (aka the Cocceius Tunnel, circa. ...
  • Cripta Neapolitana (circa.


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“The first infrastructures of this type were built at the end of the 19th century, and at present there are nearly 200 underwater tunnels built worldwide. Although some are used for water and electricity supply, most are used to house road or rail connections.

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The longest tunnel in the United Kingdom is the Northern line at 27,800 metres (91,200 ft). This will be superseded in the 2020s by the 37,600-metre (123,400 ft) Woodsmith Mine Tunnel in North Yorkshire that will transport polyhalite from North Yorkshire to a port on Teesside.

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The Channel Tunnel is made of three separate tunnels running parallel to each other. One train tunnel running south (UK to France), one train tunnel running north (France to UK) and one service tunnel. All three tunnels were drilled below the seabed and link Folkestone in Kent to Coquelles in Pas-de-Calais.

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