About tunnel
A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.

Tunnel

empty hallway with lights turned on
empty hallway with lights turned on
time lapse photography of vehicle under tunnel
time lapse photography of vehicle under tunnel
gray concrete tunnel with light
gray concrete tunnel with light
empty grey road
empty grey road
gray concrete train tunnel
gray concrete train tunnel
tunnel with light turned on during night time
tunnel with light turned on during night time
photo of black and brown subway
photo of black and brown subway
silhouette of man under tunnel
silhouette of man under tunnel
man wearing gas mask holding torch inside tunnel
man wearing gas mask holding torch inside tunnel
The train leaves the tunnel in the mountains
The train leaves the tunnel in the mountains
green-leafed tree outside tunnel
green-leafed tree outside tunnel
black tunnel with orange lights
black tunnel with orange lights
empty road tunnel leading to mountains
empty road tunnel leading to mountains
Digitally rendered image of architectural fragment
Digitally rendered image of architectural fragment
silhouette of man walking on tunnel during daytime
silhouette of man walking on tunnel during daytime
brown lit concrete pathway
brown lit concrete pathway