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HardyworkershavebuiltandmaintainedNewYork'ssubwaylinesformorethan150years,enduringhazardousconditions800ftbelowthestreet.Thisprogrammefollowsthenewgenerationof'Sandhogs'-twoofthemBritish-whorisktheirlivesblastingthroughrockandrubbletocreatetwonewlinescommissionedbythecity.