Northern section of land tunnel.
[Shaft of Ashokan Water Tunnel.]
[Tunnel construction.]
[Holland Tunnel.]
[Subway tunnel.]
[McAdoo Tunnel.]
Railroad tunnels and bridge, south of Central Avenue.
[Man shaping a horseshoe.]
[Man putting horseshoe on a horse.]
Unidentified tunnel.
[Constructing the McAdoo Tunnel.]
Man inside the southern end of a river tunnel.
The Holland Tunnel
[Streetcar tunnel.]
Southbound express tunnel.