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Metro Tunnel

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.

TBM cross section

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