Watch After 4 Years, Seattle''s Giant Tunneling

Bertha, the largest boring machine in North America, has reached the light at the end of the tunnel, after getting stuck, and sitting motionless

Underground Boring Machines: A Guide to TBMs for Tunnels

Tunnel boring machines enable safe, efficient, precision boring of underground tunnels through a vast range of geological conditions. This guide provided an overview of how

Swordsmith skill helps build tunnel digger as heavy as Eiffel Tower

China has built the world''s largest tunnel-boring machine that weighs 10,000 tons and uses an ancient Chinese swordsmaking technique.

China''s largest drill tackles world''s most ambitious

The Jianghan Ping''an Tunnel Boring Machine (TBM) began operations earlier this month on January 5th, on what might not only be

World''s largest hard rock water tunnel boring machine

The City of Dallas unveiled the Big Tex tunnel-boring machine (TBM) at the Mill Creek Drainage Relief Tunnel. The 38-ft by 230 ft long

What Tunnel Boring Machine ? Explained

In today''s age of infrastructure growth and rapid urbanisation, building tunnels for metro systems, highways, water supply, and sewage projects has become essential. Among

The largest tunnel boring machine (TBM) in the world

The tunnel will become a double-decker highway, scheduled to open in 2019 It was in April of 2013 that the 57-foot wide boring machine arrived in Seattle

Exploring Tunnel Drilling Machines: Types, Technology, and Uses

A Tunnel Boring Machine (TBM) is a large, complex piece of equipment used to excavate tunnels through various soil and rock conditions. It features a rotating cutter head

Innovative Tunnel Digging Machines: Transforming Underground

Tunnel boring machines are specialized equipment designed for excavating tunnels with precision and efficiency. They are capable of boring through various types of

Top Equipment Used in Tunnel Construction and How It Works

Tunnel boring machines carve through solid rock. Conveyor systems move heavy materials with ease. Shotcrete machinery strengthens tunnel walls, and Rockwheel

Largest Tunnel Boring Machines (TBM) in the World

Powerful tunnel boring machines excavate, remove materials, and install walls. The world''s largest measures 17.63 m. Here are the five biggest

Top 10 Biggest Tunnel Boring Machines in the World

Here is the list of Top 10 Biggest Tunnel Boring Machines in the World, Massive next-generation tunnel boring machines that can dig rock walls, remove the material, and place concrete

Assessment of slurry chamber clogging alleviation during ultra-large

To fundamentally alleviate the excavation chamber clogging during slurry tunnel boring machine (TBM) advancing in hard rock, large-diameter short screw conveyor was

China''s largest-diameter dual-shield TBM launched to

China''s largest-diameter dual-shield, self-developed TBM (Tunnel Boring Machine), the "Jianghan Ping''an," was launched on Sunday in

Tunnel Boring Machine Cost: New, Used, Rent

Tunnel Boring Machines are key in today''s construction. They affect tunnel digging costs and overall project expenses. Let''s dive into the world of TBMs and their role in

Hard grind: The epic journey of the world''s biggest

On April 4, the world''s largest tunnel boring machine broke through to the open air after almost four years underground. Called Bertha, the giant

Largest Diameter TBM in Singapore Launched Successfully

On 9 May 2025, AECOM attended the launch ceremony of Singapore''s largest tunnel boring machine (TBM) to date — a major milestone for the Cross Island Line Phase 2 project (CR202

NFM Technologies

NFM Technologies For more than 20 years, NFM Technologies has been designing and manufacturing large diameter tunnel boring machines ranging from 4 m to more than 15 m,

Big Bertha''s Two-Mile Subterranean Journey Is Almost Over

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.

Bertha (tunnel boring machine)

OverviewNameDesign and assemblyExcavationControversySee alsoExternal links

The name Bertha, after Seattle''s first female mayor, Bertha Knight Landes, was chosen by a panel (that included the Governor and Transportation Secretary) from 150 submissions from kindergarten through 12th graders, who were asked to submit female names with Washington state heritage. The winning entry, which was submitted by two elementary schools in Poulsbo and Hoquiam, was selected in December 2012.

Tunnel Boring Machine (TBM): Crucial (and optimal)

Tunnel Boring Machine (TBM) have revolutionized the approach to tunnel construction providing a precise and efficient mechanized solution.

Mighty breakthrough for Europe''s biggest boring machine

On June 8, 2020, the largest tunnel boring machine (TBM) built and used in Europe crowned its tunnelling mission with a mighty breakthrough. With this project milestone, the

Meet Big Bertha, The World''s Largest Tunnel Boring Machine (TBM)

Big Bertha was manufactured and supplied by the Hitachi Zosen Corporation to Seattle Tunnel partners for the SR 99 tunneling project. It measures 57.2 feet (17.5 m) in

Largest tunnel boring machine

Such machines have to be pressurized to prevent the tunnel flooding, and line the walls behind them with a watertight combination of grout and precast interlocking concrete blocks. The

Tunnel Boring Machines: Working, Types, and Applications

Tunnel Boring Machines (TBMs) are large, specialized equipment used to excavate tunnels through various soil and rock conditions with minimal disturbance to the