Underwater housing refers to structures designed for living or working beneath the surface of the water. These habitats can be used for various purposes, including scientific research, tourism, and marine conservation. They are engineered to withstand high pressure and provide a safe environment for occupants, often featuring large windows for viewing marine life. These habitats can be found in various locations, such as coral reefs or deep-sea environments. Some underwater housing projects, like the Jules' Undersea Lodge, allow visitors to experience life underwater, while others, like the Aquarius Reef Base, serve as research facilities for scientists studying ocean ecosystems.