Mary, the tunnel boring machine that has been paving the way for the expanded Hampton Roads Bridge-Tunnel, hit a milestone Wednesday when she finished the first of twin tunnels that are part of the ...

Rosie, the tunnel boring machine named after Akron's own Rosie the Riveter, has a sister coming to town later this year, and her name is Elaine. Named after environmental advocate Elaine Marsh ...

Tunnel boring machines (TBMs) are very picky about the rocks they chew through. This is why geologists must monitor the rock at the head of every tunnel. On good days, TBMs can bore through rock ...

The tunnel boring machine known as Chessie got back to work on April 8, days before the 60th anniversary of the bridge-tunnel’s opening on April 15, 1964.

VTA asks residents to name its $76 million tunnel boring machine The tunnel boring machine was purchased last year and cost $76 million By Grace Hase | ghase@bayareanewsgroup.com | Bay Area News Group ...

Mary, the tunnel-boring machine, is on the move again! Thursday, Mary began boring a twin eastbound tunnel in part with the HRBT Expansion Project.

Here's how the tunnel boring machine, or TBM, works: As the 200-ton TBM moves forward, a round cutter head studded with titanium teeth grinds into the tunnel face and splits large chunks off the rock.