Civilian submarines are underwater vessels designed for non-military purposes, primarily used for research, exploration, and tourism. These submarines can operate at various depths and are often equipped with advanced technology to study marine life, underwater ecosystems, and geological formations. They provide a unique opportunity for scientists and enthusiasts to explore the ocean's depths without the risks associated with deep-sea diving. In recent years, civilian submarines have gained popularity in the tourism industry, allowing passengers to experience underwater adventures. Companies like OceanGate and SubSea Explorer offer trips to view shipwrecks and coral reefs, making the ocean more accessible to the general public while promoting marine conservation awareness.