Harriet the tunnel boring machine completes second rail tunnel for Crenshaw/LAX Line | The Source

Harriet the tunnel boring machine completes second rail tunnel for Crenshaw/LAX Line | The Source

Live Video: Watch Bertha the worlds largest tunnel boring machine emerge from beneath downtown Seattle

Live Video: Watch Bertha the worlds largest tunnel boring machine emerge from beneath downtown Seattle

Meet our giant tunnelling machines - Crossrail

Meet our giant tunnelling machines - Crossrail

Crossrail end of TBM tunnelling progress map June 2015_199945

Crossrail end of TBM tunnelling progress map June 2015_199945

Crossrail tunnelling - 360° image gallery

Crossrail tunnelling - 360° image gallery

Crossrail’s 26 mile tunnelling marathon complete

Crossrail’s 26 mile tunnelling marathon complete

TBM Phyllis unveiled at Westbourne Park, March 2012

TBM Phyllis unveiled at Westbourne Park, March 2012

Europe's largest construction project

Europe's largest construction project

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