Submerged structures are man-made or natural formations that exist below the surface of water bodies, such as oceans, rivers, or lakes. These structures can include bridges, tunnels, pipelines, and foundations for buildings or wind turbines. They are designed to withstand water pressure and environmental conditions while serving various purposes, such as transportation, energy generation, or habitat creation. The study of submerged structures involves understanding their design, construction, and maintenance. Engineers and architects must consider factors like water currents, marine life, and sedimentation when planning these structures. Proper design ensures safety and longevity, minimizing the impact on the surrounding aquatic ecosystem.