tunnels (6 photos)

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lava tube cave, basalt, caving, galleries, lava beds national monument, lava tube cave, lave cave, natural cave, spelunking, tunnels, volcanic

water adits - shrinagar dam construction (india), adits, alaknanda valley, construction, hydro electric, india, shrinagar dam, tunnels

water adits, shrinagar dam construction, india

adits to teesta power house - tunnels entrances (india), adit, hydro electric, india, road, teesta river, tista, tunnels, west bengal

adits to teesta power house, tunnels entrances, india

cilanbolu tunnel (amasya), amaseia, amasya, archaeology, cave, cilanbolu cistern, mağara, mağarası’nda, stairs, steps, tunnels, tüneli, water cistern, water well

cilanbolu tunnel, amasya

train tunnels - el chorro gorge (spain), desfiladero de los gaitanes, el caminito del rey, el camino del rey, el chorro, railroad, railway, signs, trespassing, tunnels, urbex

train tunnels, el chorro gorge, spain

train tunnel entrances - petite ceinture - abandoned railway (paris, france), paris, railroad switch, railroad tracks, railway tracks, trespassing, tunnels

train tunnel entrances, petite ceinture, abandoned railway, paris, france