A miner climbs on excavated rocks after a giant Sissi drill machine broke through the last section of rock at the construction site of the NEAT Gotthard Base Tunnel in Switzerland on March 23, 2011. Crossing the Alps, the world's longest train tunnel consists of two, parallel, single-track tunnels, each a length of 35 miles. The project should become operational at the end of 2016.

A miner climbs on excavated rocks after a giant Sissi drill machine broke through the last section of rock at the construction site of the NEAT Gotthard Base Tunnel in Switzerland on March 23, 2011. Crossing the Alps, the world's longest train tunnel consists of two, parallel, single-track tunnels, each a length of 35 miles. The project should become operational at the end of 2016.

TBM Elizabeth and Victoria ready to dig, October 2012

TBM Elizabeth and Victoria ready to dig, October 2012

tunnel boring machine

tunnel boring machine

New Crossrail images show tunnelling marathon under the streets of London - Telegraph

New Crossrail images show tunnelling marathon under the streets of London - Telegraph

Foreuse top hammer / horizontale / sur chenilles / pour pierre de taille ø 45 - 89 mm | DQ500 Sandvik Mining

Foreuse top hammer / horizontale / sur chenilles / pour pierre de taille ø 45 - 89 mm | DQ500 Sandvik Mining

underground mining Atlas Copco

underground mining Atlas Copco

Tuneladora

Tuneladora

Jumbo Axera de dos brazos

Jumbo Axera de dos brazos

sketch of a mix shield tbm

sketch of a mix shield tbm

triplex TBM

triplex TBM

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