Sergei Papin
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Sergei Papin is the chief tunneling engineer for Systra, the consulting firm for the metro project in Hanoi. He has addressed the nature of the materials being ejected during construction, assuring that they are environmentally friendly and meet stringent European standards.
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Sergei Papin stated that the material erupting to the surface is a mixture of mud, water, and tunnel excavation additives.
Bùn vẫn trào lên do khoan ngầm dự án metro Nhổn - ga Hà NộiVnExpress – leading Vietnamese online newspaper, est. 2001·
Vietnam· 2025-02-22
Vietnam· 2025-02-22
