The Scubster is a unique underwater vehicle that serves as a pedal-powered personal submarine for scuba divers. It features two rotating propellers for easy maneuverability and can perform impressive movements like corkscrews. The vehicle is designed for divers equipped with scuba gear and also has an electric version that can reach speeds of 4 km/h. After being in development since 2011, the Scubster is currently in pre-production, and a video showcases its agility in action.