Renewable energy subsea refers to the exploration, development, and operation of offshore renewable energy resources, particularly wind and tidal energy, beneath the ocean's surface. Offshore wind farms harness the strong and consistent winds over the ocean to generate electricity using wind turbines mounted on fixed or floating platforms anchored to the seabed. These installations, typically located in coastal or deep-sea areas, offer significant advantages such as higher wind speeds and reduced visual impact compared to onshore wind farms. Tidal energy, on the other hand, captures the kinetic energy of ocean currents and tides using underwater turbines or other devices installed on the seabed. Subsea renewable energy projects require specialized technologies for installation, maintenance, and grid integration due to the challenging marine environment. However, they hold immense potential for providing clean, reliable, and sustainable energy while contributing to the diversification of the energy mix and the reduction of greenhouse gas emissions. Continued research, innovation, and investment in subsea renewable energy are essential for unlocking this vast resource and accelerating the global transition towards a greener future.