Underwater structures refer to man-made or natural formations located beneath the surface of water bodies, such as oceans, rivers, and lakes. These can include bridges, tunnels, oil rigs, and submarine cables, which are designed for various purposes like transportation, resource extraction, and communication. Natural underwater structures, such as coral reefs and seamounts, play crucial roles in marine ecosystems. They provide habitats for diverse marine life and contribute to the overall health of ocean environments. Understanding these structures is essential for conservation efforts and sustainable development in aquatic regions.