The crossborder road is in mountain tunnel, so it is impossible to cross the border on foot.

It was known as the "tunnel highway" because of the seven mountain tunnels along its Appalachian route.

It's a jazzy sound, best appreciated when the car plunges into a mountain tunnel.

Stephan manages to plant explosives on a train which he sets to go off in a mountain tunnel.

The diagram below shows the relationship between these underground structures in a typical mountain tunnel.

For nearly 100 ft you crawl through a natural mountain tunnel before arriving at the cable tranverse.

The trains go through the mountain tunnels the way real ones would.

Along the way, the tracks cross some 30 bridges and trestles and pass through two deep mountain tunnels.

The two cities are now linked by a dual-pavement highway that passes through two mountain tunnels.

A pair of grizzled men gestured with their weapons for the captives to enter the mountain tunnels.