Efficient method of eliminating accidental damage of sewer tunnelDmitriy Goncharenko, Olga Starkova, Alevtyna Aleinikova, Yulyia Kolomiiets and Oksana GreenchukMATEC Web Conf., 230 (2018) 02011DOI: https://doi.org/10.1051/matecconf/201823002011