As with option 4, but services would also be provided to a central city station via a tunnel.

It is currently reached via tunnels and 130 steps of stone.

Players will now exit the dressing rooms via a tunnel.

Three of the four buildings are connected via underground tunnels.

It flows under one of the runways via a tunnel.

The museum, gallery and center are connected via underground tunnels.

Rather than being fed directly, the water comes via a tunnel and pipeline (with a drop of 650m).

Each tower provides water to a respective stage of the power plant via tunnels.

In 1969 the west wing was connected to the theatre via an underground tunnel.

The two-car garage was connected to the house via tunnel.