The number of people who die in sewer systems varies depending on the country and the specific circumstances. However, it is known that working in a sewer environment can be hazardous and potentially life-threatening if proper safety protocols are not followed. According to the US Bureau of Labor Statistics, there were 13 fatalities in the "sewage and waste material treatment and disposal" industry in 2019 in the United States. 

It is important to note that this figure may not include all incidents or fatalities that occur in sewer systems, as some incidents may not be reported or classified in this category. It is crucial for workers to prioritize safety measures and receive proper training and equipment to minimize the risk of injury or death in sewer environments.
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