Subsea engineering is a specialized field of engineering focused on the design, construction, installation, operation, and maintenance of systems and infrastructure located on or beneath the seabed. This discipline investigates the unique challenges posed by the marine environment, including hydrostatic pressure, temperature extremes, corrosion, and dynamic seabed conditions, requiring the integration of mechanical, civil, electrical, materials, and marine engineering principles. Its key characteristics involve the application of advanced technologies for remote operations, structural integrity, and flow assurance in deepwater and ultra-deepwater settings. The significance of subsea engineering lies in enabling the safe and efficient extraction of offshore hydrocarbon resources, facilitating renewable energy installations, supporting telecommunications infrastructure, and advancing marine scientific research, contributing critically to global energy security and economic development.