An innovative, eel-like robot developed by engineers and marine biologists can swim silently in salt water without an electric motor. Instead, the robot uses artificial muscles filled with water to propel itself. The foot-long robot, which is connected to an electronics board that remains on the surface, is also virtually transparent.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/04/180426102906.htm
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