U.S. Navy developing robotic fish drone for spying operations
'... The 5-foot, 100-pound unmanned underwater vehicle swims and behaves like a bluefin tuna fish, waving its tail back and forth to propel itself. Its developers say the natural swimming motion of fish is less detectable than typical torpedo-shaped drones.
"This is part of a new field of underwater unmanned vehicles that use biomimicry," project lead Marine Corps Capt. Jerry Lademan told Mashable. "The idea is to use what evolution has already perfected over a couple thousand years, take the best parts of that and make it into a mechanical device."