kottke , 
Seabike is an “underwater mobility device” that can propel you through the water at “superhuman speed”. You pedal with your feet, driving a small propellor. https://newatlas.com/marine/seabike-swimming-propeller/
kottke , Seabike is an “underwater mobility device” that can propel you through the water at “superhuman speed”. You pedal with your feet, driving a small propellor. https://newatlas.com/marine/seabike-swimming-propeller/
