A 700-foot-long tunnel boring machine named Mary is being assembled in Washington, D.C., to dig a 5.5-mile stormwater and ...

DC Water took a major step Tuesday in the Potomac River Tunnel Project, lowering the cutterhead for ‘Mary,’ the tunnel boring ...

Amtrak’s work to overhaul the first of two tubes of the East River Tunnel is on schedule, officials of the federal railroad said Wednesday. “The tunnel is looking like it’s in great shape,” Laura ...

D.C. Water is making progress with an initiative that aims to clean up the District’s waterways — the Potomac River tunnel ...

ST. LOUIS (KTVI) — More than 30 feet below the ground in St. Louis’ Forest Park sits a system of tunnels. They’re part of the River Des Peres, where over four miles of its nearly 10-mile path sit ...

Deep under the Yangtze River, a stranded tunnel boring machine that looked like a sunk cost has instead become a showcase of ...

In rendezvous beneath the Yangtze River, a multimillion-dollar tunnel boring machine meets its stalled twin with just 2mm of ...