and the machine purpose-built for the job is the world's largest tunnel boring machine (TBM), christened "Bertha." Built by Hitachi Zosen, the 300-foot-long doomsday machine is excavating a 57.5 ...

The name of the tunnel boring machine, Chessie, came from then-sixth grader Grace Bentley of Nandua Middle School. Chessie removed about 500,000 cubic yards of soil and installed about 10,000, 10 ...

Tunnel boring machines (TBMs) prefer to chew rocks, not mud. Besides, they can't support the wet ground, so the tunnel walls are collapsing! TBMs work much better in rock tunnels. Try this ...

Chessie, a tunnel-boring machine, has completed her work on the ... And you can watch the big breakthrough moment in time lapse with the video embedded at the end of this story.

VIRGINIA BEACH, Va. — After multiple delays, including a 9-month delay involving a century-old anchor, the Chesapeake Bay Bridge-Tunnel (CBBT) expansion achieved a major milestone as its tunnel boring ...

And you can watch the big breakthrough moment in ... Chessie has been a mining workhorse for Bay Bridge Tunnel project Chessie, the newly named tunnel boring machine for the Thimble Shoal Parallel ...