Fig. 2
Robot demonstration. a An illustration of robot locomotion. The robot can walk on level ground, swim on the water surface, dive into water, walk underwater, and make transitions between ground, the water surface, and the underwater environment. b Top view composite image of the robot demonstrating hybrid locomotion described in a. Scale bar, 5 cm. c Side view of the robot walking down an incline and transitioning from land to the water surface. d The robot swims on the water surface. e The robot climbs an incline when it is fully submerged in water. f The robot gradually emerges from the air–water interface. g The robot completely exits water. Scale bars (c–g), 1 cm. In c–g, two drops of blue food coloring are added to deionized water to enhance the color of water in side view images
