A traffic control centre staffed by 50 personnel continually monitors the tunnel using 250 cameras.

In my view there was only one hope, and that was to build the tunnel using private venture capital.

When the gold had been exhausted, they followed the auriferous seams underground by tunnels using fire-setting to break up the much harder gold-bearing rocks.

The buses were dual-powered, operating as trolleybuses in the tunnel using electricity from overhead wires and as diesel buses on city streets.

The excavation of tunnels using the cut-and-cover method have resulted in large scale detouring of road traffic.

When attacked, wombats dive into a nearby tunnel, using their rumps to block a pursuing attacker.

Each fossil had to be dragged out of the narrow tunnel using ropes.

Typically the air is moved through the tunnel using a series of fans.

They plunged into the dark tunnel using their torches for added light.

For seven months, 800 Irish workers built the tunnel using the "cut and cover" method later employed for most of the city's subways.