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    A manhole (utility hole, maintenance hole,[1] or sewer hole) is an opening to a confined space such as a shaft, utility vault, or large vessel. Manholes are often used as an access point for an underground public utility, allowing inspection, maintenance, and system upgrades. The majority of underground services have manholes, including water, sewers, telephone, electricity, storm drains, district heating, and gas.

    At its most basic, yes, a manhole is a hole in the ground with a cover. But manholes and their covers vary in the materials used to make them and the specific purpose they serve. Here are the most common types of manholes used today: