Tunnel boring machines
Tunnelling update
TBM Joan has finished the first section of the Metro Tunnel and is now being delivered back to the Arden Station site.
She dug 1,205m and installed 703 rings.
TBM Meg has travelled more than 999 metres toward Kensington and has installed more than 583 rings to line the tunnel.
Learn more about our TBMs
Explaining the tunnelling process
In August 2019, as Joan the TBM prepared to launch, our Director of Tunnels and Underground Stations explained how the tunnelling process ahead.
Managing noise and vibration during tunnelling
Managing noise and vibration during tunnelling will be based on a best practice approach as undertaken by Metro Tunnel’s contractors on similar projects around the world.
Prior to tunnelling, comprehensive geological testing and environmental assessments are completed.
Property condition surveys will be offered to properties based on an environmental assessment.
Properties located near the path of the TBMs may experience low levels of noise or vibration, however individuals experience noise and vibration differently. During tunnelling, noise, vibration and ground movement will be managed in line with strict Environmental Performance Requirements.
Properties located near the path of the TBMs will be contacted with further information prior to tunnelling commencing in their area.
Learn more
- A scale model of our TBMs is on display at Metro Tunnel HQ on Swanston Street.
- Dig into more details in our TBM fact sheet (PDF, 935.3 KB) and Tunnelling fact sheet (PDF, 692.1 KB)