The first of eight highly specialised Tunnel Boring Machines (TBM), which each weigh nearly 1,000 tonnes, is being positioned at Royal Oak in west London...

The first of eight highly specialised Tunnel Boring Machines (TBM), which each weigh nearly 1,000 tonnes, is being positioned at Royal Oak in west London...

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A tunnel boring machine that was used at Yucca Mountain nuclear waste repository

A tunnel boring machine that was used at Yucca Mountain nuclear waste repository

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tunnel boring machine | This is how a tunnel boring machine will burrow a viaduct under ...

tunnel boring machine | This is how a tunnel boring machine will burrow a viaduct under ...

On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle. “Bertha,” as it’s known, will spend the next 14 months boring a 1.7 mile (2.7 km) tunnel under the city to replace a viaduct damaged in a 2001 earthquake. Gizmag took a look inside the giant machine.

On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle. “Bertha,” as it’s known, will spend the next 14 months boring a 1.7 mile (2.7 km) tunnel under the city to replace a viaduct damaged in a 2001 earthquake. Gizmag took a look inside the giant machine.

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More than 150 feet below the streets of Seattle, Bertha presses on, boring a 57.5-foot diameter tunnel underneath the city. The largest tunnel boring machine (TBM) in the world when it was built, Bertha weighs a gargantuan 6,700 tons and stretches 326 feet long.

More than 150 feet below the streets of Seattle, Bertha presses on, boring a 57.5-foot diameter tunnel underneath the city. The largest tunnel boring machine (TBM) in the world when it was built, Bertha weighs a gargantuan 6,700 tons and stretches 326 feet long.

Elon Musk to dig tunnel to ease traffic in LA, but he doesn't yet have permission | Technology | The Guardian

Elon Musk to dig tunnel to ease traffic in LA, but he doesn't yet have permission | Technology | The Guardian

Bertha is a giant marvel of engineering, both literally and metaphorically. Currently, Bertha is the largest diameter tunnel boring machine in the world, though a slightly larger one (by about a quarter foot) was used last year in China for a short section of tunnel before it was converted back to a smaller machine for the rest of the work. http://www.popularmechanics.com/technology/infrastructure/news/a24895/seattle-big-bertha-tunnel-boring-machine/

Bertha is a giant marvel of engineering, both literally and metaphorically. Currently, Bertha is the largest diameter tunnel boring machine in the world, though a slightly larger one (by about a quarter foot) was used last year in China for a short section of tunnel before it was converted back to a smaller machine for the rest of the work. http://www.popularmechanics.com/technology/infrastructure/news/a24895/seattle-big-bertha-tunnel-boring-machine/

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