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Mine, tunnel front, silhouette of a standing worker

The entrance to the old abandoned limestone adits.

People exploring a massive Mine Cave in Garmsar of Iran

A man stops inside the dark cave, his flickering lantern the only source of light.

A scenic view of a wooden walkway inside a cave with natural rock formations

Close-up of the rugged rock wall lining an underground tunnel

$Mammut Cave\nCave labyrinth of superlatives\nThe endless expanse of the Dachstein massif from inside, the giant Mammut Cave is one of the largest karst caves in the world.$

Group of miners in a mine underground holding tools and wearing helmets while standing in a dark tunnel

light in cave, beautiful photo digital picture, beautiful photo digital picture

Landscapes of Froya Island, off Trondheim, Norway

Gypsum cave with deep tunnels. Old abandoned galleries underground. Different rocks, geological and speleological research.

The stone secret cave inside

A tunnel carved into shell rock, Odessa catacombs of the 18th century, Ukraine

A through tunnel, formerly used for transporting marble trolleys, in the Ruskeala Mountain Park on a summer day.

Mineral formations of Balatini Cave, one of the caves declared as a national park in Turkey

Group of men in a dark mine underground - mining concepts

Rocks and stones in Neptune Caves, underground rock formation illuminated with artificial light forming shadows, cracked, rough and uneven walls, Couvin, Wallonia, Belgium

Various valleys and gullies of water at the bottom of Lake Cerkniška in Slovenia. The lake thus dries up and flows into underground rivers approximately every 50 years.

tunnel dug by soldiers on the rock in the first world war on the slopes of mount Pau with a tree in the background in the Vicentine Alps in Veneto Italy

Pedestrian tunnel through a rock or mountain near Petrovac town in winter time, Montenegro. High quality photo

People in Spooky Cave in Black and White.

A illuminated tunnel inside a old mine

a tunnel digged in the rock. Italian Alps

An Asian woman is enjoying exploring dark cave.

Aokigahara sea of tree Jyukai and hyoketsu ice cave in Mt Fuji and Mt Ohmuro in shizuoka and Yamanashi, Japan.

$Uplistsikhe, an ancient cave city in Georgia, one of the first cities on the territory of GeorgiaUplistsikhe, an ancient cave city in Georgia, one of the first cities on the territory of Georgia\nUNESCO World Heritage Site$

Close-up of abandoned railroad tunnel through bedrock in Connecticut, black and white. The Shepaug Valley Railroad ran through here from 1875 to 1948. To create the tunnel, Pennsylvania miners blasted through 235 feet of schist, a metamorphic rock. It was a very tight fit for the steam locomotive and train cars. The tunnel and footpath are in the Steep Rock Reservation, a nature preserve in Washington, CT. Some people are afraid to walk through.

The group of cave explorers in the cave Sumgan. Russia, south Ural..

Two senior woman walking through tunnel at Myra Canyon

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