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Blast tunnel in a bomb shelter

View of a Salt Mine Cave next to the Salt formations in Garmsar of Iran

Communication tunnel at underground bunker or subway, etc.

An old abandoned mine located near the Salmon Glacier in northern British Columbia.

A narrow, pedestrian tunnel that is painted white and illuminated by fluorescent light fixtures sits empty.

Picture is of Castle Rock Colorado taken from the rock park looking down the valley at Pikes Peak.

$Looking through the abandoned rail tunnels on Donner Summit. The original Central Pacific line, opened in 1887, was later covered with these \$

Coal mine underground corridor with support system

Goriano Sicoli, Italy The Olmo di Bobbi car tunnel through the mountains in the Abruzzo National Park.

speeding through the tunnel with pocket watch

View of the mine entrance for copper mining.

Freeway tunnel near Byron Bay, NSW, Australia

An old abandoned mine entrance in Colorado.

Copper Mine tunnel located in the town of Hyder, Alaska but situated within British Columbia.

Shot on film and scanned shot of tunnel at Yosemite National Park, California.

Double tunnels on snow covered dirt road through 11 mile canyon near Lake George, Colorado west of Colorado Springs, USA, North America.

Mine/tunnel entrance at night

Mueller Tunnel In San Gabriel Mountains Peak Mount Lowe Hiking Trail inside Angeles National Forest On Old Railway Road

Highway Road Tunnel with luminous safety lights

Coal mine underground corridor with support system

Kond pedestrian tunnel with sagging walls in Yerevan city on summer moning

Underground corridor with steel support system in Makoszowy coal mine, Poland

Old underground road tunnel inside mountain

salvador, bahia, brazil - january 15, 2021: sewage and rainwater collection pipes are seen in the Ondina neighborhood in the city of Salvador.

Danger High Voltage Authorized Personnel Only Sign at Subway Tunnel.

Canada British Columbia, Fraser canyon highway.

Tunnel in the way to the beach on the Imigrantes highway. Parrked into the tunnel in a SOS area.

Pikes Peak from the east in Colorado Springs, Colorado in western USA of North America

View of state highway in Colorado, USA, through red rocks formations at sunset in winter; tunnel in background

Rifugio Bunker antiaereo della Seconda Guerra Mondiale di Nera Montoro in Umbria

Free Images: "bestof:Cheyenne Mtn, Interior const, early tunneling.jpg NORAD blast doors Cheyenne Mountain Colorado USAF photo URL https //www cheyennemountain af mil PD-USGov"

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