The tunnel boring machine is driving the roughly 10.5-mile headrace tunnel from the high level Tantangara Dam to an underground powerhouse. A second TBM will form the 3. 7-mile tailrace down to ...

In an interview, he recalled the final days of the battle for the Iraqi city of Mosul, where Islamic State fighters hid in a series of tunnels in 2017. “Our Iraqi soldiers were clearing out ...

Autonomous Air-ground Cooperative Tunnel Inspector incorporates three cutting-edge technologies: multi-robot cooperation between Unmanned Ground Vehicle (UGV) and Unmanned Aerial Vehicle (UAV ...

SAFETY IN RIVER TUNNELS; Pennsylvania Road Decides on Method of Construction. Will Have Concrete Sidewalks Level with Car Windows -- Great Under- ground Station -- Bids Advertised For.