Underwater installations refer to structures or systems built beneath the surface of water bodies, such as oceans, rivers, or lakes. These can include oil rigs, submarine cables, and underwater pipelines, which are essential for energy production, communication, and transportation. Engineers design these installations to withstand harsh underwater conditions, including pressure, currents, and marine life. These installations often require specialized equipment and techniques for construction and maintenance. For example, remotely operated vehicles (ROVs) are commonly used to inspect and repair underwater structures. Additionally, underwater installations play a crucial role in supporting marine ecosystems and facilitating research in marine biology.