old round dirty underground technical tunnel heating duct with rusty pipeline |
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navigate by keyword : abandoned architecture building candle ceiling circulation concept concrete construction corridor dark deep digger dirty duct ducting ductwork engineering exploring factory gray heat heating industrial industry inside light line mechanical metal modern passage pipe pipeline round rusty sewer steel subterranean system technology temperature tube tunnel underground urban urbex ventilation voronezh warm |
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Old round dirty underground tunnel of heating duct with rusty pipeline |
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