Let’s file this one under, “But why would you want to?” Brothers Dmitry and Timophey Ryabikiny have designed an underwater two-seater motorcycle. No special equipment is needed as the design includes a helmet with air supply available and a system to prevent glass steam-up. The Russian Aqua Star has two motors, the second one allowing the rider to maneuver by pressing and holding a button. The bike can go to a depth of 12 meters and move 7 km/hour. The brothers plan on making their prototype available next summer.