As of now, the robot is a cylindrical aluminum vessel with turtle-inspired flippers, which will help it propel itself through the water. Concept designs include the more realistic-looking turtlebot seen above. The research team at ETH Zurich started with a tuna in 2008, studying how to imitate its movement in water. The main goal is to pick a winner between flapping fins and propellers. Whichever is more efficient could power new generations of ocean-inspired underwater autonomous vehicles.