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Ruda Slaska, Poland - November 05, 2015:  Coal mine. Stairs in a  mine tunnel
view of an inactive mine shaft
During a public tour of the 1890s built Mollie Kathleen Gold Mine near Cripple Creek, Colorado, 1,000 feet down, the wire mesh elevator leads to string of lights down a side tunnel with ore cart tracks for moving rock filled ore carts.
Tunnel with concrete walls in old abandoned Soviet bunker.
Coal mine underground corridor with support system
Underground corridor in an old gold mine and arsenic
Cargo skip shaft of an underground mine
Group of men in a dark mine underground - mining concepts
Wagon with bauxite rocks in a tunnel inside the Farcu mine, Apuseni mountains, Romania The cave is valuable for its rich content of crystals, which are unique in Romania
Bex, Vaud Canton, Switzerland - 8 April 2023: Underground of Bex salt mine in Switzerland. Illuminated walkways.
Dark tunnel with fog
Underground equipment. Special load vehicle for mines and tunnels. Iron ore mine
Appearance of Xiamen Metro in China on July 19, 2023
Tunnel of the mining of an underground mine. Lots of pipelines on the ceiling and rail track for trolleys.
On board a train
Young miner descending the stairs of a coal mine.
Old abandoned mine with rusty trolley train.
Tunnel Underneath the Hetch Hetchy Resevoir  in Yosemite
Construction Machinery Working in Tunnel Construction
Hand-dug tunnel. It continues straight into the distance. You can also see traces of reinforcement. A small electric light is lit inside the tunnel. A small electric light glows orange. Unazuki, Kurobe City, Toyama Prefecture. Abandoned trolley tracks.
Tunnel Boring Machine (TBM) )that is being moved inside an underground tunnel.
Jachymov - Mining adit number 1 - mining museum, a reminder of silver and uranium mining in Ore Mountains/Erzgebirge, Bohemia, Czech Republic. It is Mining Region of UNESCO World Heritage
Miner working at a dark mine underground wearing a helmet and holding tools
Mining process deep underground in a lead and zinc mine Real Del Monte, Hidalgo, Mexico
typical old tunnel at madeira island, portugal.
Detail of old underground tunnel in the city, access for people
Lava tunnels on the island of Santa Cruz in the Galapagos Archipelago, Ecuador
Mine tunnel with path
Excavation  of hard coal mine with support system and drilling machine
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