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Construction of the Severomuysky tunnel on the Baikal-Amur Mainline
March 1977. USSR. Buryat ASSR. Mechanized column No. 139 of the Zapbamstroymekhanizatsiya trust during pre-portal excavation of soil during the construction of the Severomuysky tunnel on the Nizhneangarsk-Vitim section of the Baikal-Amur Mainline. The exact date of the photo has not been established. Vladimir Matvievsky/TASS