Manholes are essential components of a city's sewage and underground infrastructure. They allow access to underground pipes and channels for maintenance and repair work. However, these structures are also known by several synonyms, including access points, maintenance holes, inspection chambers, and utility access chambers. Additionally, these structures are called service or utility tunnels, underground vaults, and access shafts. The names given to these structures vary by location, and the term used often depends on their function. Whatever they are called, manholes are crucial elements of modern infrastructure, and their importance cannot be understated.