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Metro Tunnel

Tunnel boring machines

Tunnelling update

TBM Joan has travelled more than 680 metres toward Kensington and has installed more than 400 rings to line the tunnel.

TBM Meg has travelled more than 375 metres toward Kensington and has installed more than 221 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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