It has two entrances and one tunnel not connected to the main underground, all on different levels.

We couldn't see daylight, but we could smell fresh air, so we knew the tunnel connected with the outside.

All platforms are connected by a pedestrian tunnel connected to platform 1.

'It's accessible only through tunnels connected to the old subway system,' Pangloss explained.

Above that door is a tunnel connected with the sea of the upper world.

At the end of the story, Hull is traveling through an underground tunnel recently connected to Asia when an unexpected earthquake kills scores of people.

Each gun is supported by an installation built in a tunnel connected to the gun turret and magazine.

The entrance led to a tunnel connected to the bunker where Katie was held captive.

The cisterns consist of two barrel vaulted tunnels connected at both ends, with internal walls covered by hydraulic mortar.

St James Station is most notable for the abandoned tunnels connected to the station.