History
While drilling and blasting saw limited use in pre-industrial times using gunpowder (such as with the Blue Ridge Tunnel in the United States, built in the 1850s), it was not until more powerful (and safer) explosives, such as dynamite (patented 1867), as well as powered drills were developed, that its potential was fully realised.
Drilling and blasting was successfully used to construct tunnels throughout the world, notably the Fréjus Rail Tunnel, the St. Gotthard Tunnel, the Simplon Tunnel, the Jungfraubahn and even the longest road tunnel in the world, Lærdalstunnelen, are constructed using this method.
Read more about this topic: Drilling And Blasting
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