Woman with yellow snorkel using water propelled flippers in ocean. Enjoying the Amphi - a hybrid propulsion powered partially by human muscles and partially by electric thruster. A similar mechanism as in an electric bike. The thruster supports your muscular effort. The more power your muscle deliver the more support Amphi transfers to the propeller. As a result you swim with minimal physical effort, but still feel like your natural motion propels you. The fin pushes you through the water, it almost feels like flying under the surface.