the former underground tunnel forest |
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| navigate by keyword : tunnel railway former line path railroad bike bicycle construction mountain tourism yuzhnosakhalinsk kholmsk trail bad gastein old nature mining landscape train outdoors road gold entrance indonesia west java |
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| A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at various points along the length |
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