Ships that use wave motion as auxiliary propulsion have already been built. A company called Wavefoil Technologies[1] designed a retractable foil that could be

Ships that use wave motion as auxiliary propulsion have already been built. A company called Wavefoil Technologies[1] designed a retractable foil that could be mounted on the bow of a ship. In moderate sea conditions, the vertical motion from waves was converted into forward thrust, which they claim resulted in 5-15% energy savings. A 71 metre fishing boat using the technology was commissioned in 2023 [2] [1] https://wavefoil.com/ https://wavefoil.com/ [2] https://www.cemreshipyard.com/en/references/nb0078-liafjord https://www.cemreshipyard.com/en/references/nb0078-liafjord