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The management of the sewer is vital to the development of the city, while the sewer workers are the guardians of the city. Working in a dark sewer is fraught with unknown dangers, and the traditional way of working is ineffecient and quite dangerous. Based on these problems, the project has reduced the risk by means of using UAV to help the workers survey the sewers. The UAV surveys the sewers through the lighting system and monitoring and detection system , and the air detection system analyses the gas content in the sewer, transferring data to the staff on the ground so as to ensure the safety of the staff.