The tunnel also contains several turnaround spots, which are reserved for disabled vehicles.

The tunnel contains two dams and hydraulic equipment of unknown purpose.

But the tunnel contained no one or nothing else that might have spoken.

Or did the tunnel contain an additional trap?

This third tunnel once contained fog and strobe lights.

Some Chileans suspect that those tunnels contain the bodies of disappeared prisoners.

As the tunnel contains two parallel tracks, it is relatively wide.

This tunnel serves to avoid a hill and contains no underground stations.

The small tunnel also contains cooking and other abandoned facilities.

These tunnels contain old rail tracks that were used to transport coal for heating.