Underground Subway Tunnel Workers Pouring Concrete

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Underground subway tunnel workers pouring concrete. Sofia, Bulgaria - April 19, 2016: Underground subway tunnel workers are pouring concrete at the railing stock videoUnderground subway tunnel workers pouring concrete. Sofia, Bulgaria - April 19, 2016: Underground subway tunnel workers are pouring concrete at the railingUnderground subway tunnel workers pouring concrete. Sofia, Bulgaria - April 19, 2016: Underground subway tunnel workers are pouring concrete at the railing stock videoUnderground subway tunnel workers pouring concrete. Sofia, Bulgaria - April 19, 2016: Underground subway tunnel workers are pouring concrete at the railing