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Different research outfits have used sea drones since 1957, when researchers at the University of Washington’s Applied Physics Lab first launched a machine called the Special Purpose Underwater Research Vehicle, or SPURV. The Soviet Union conducted its own secret research for decades and today, many consider the Russian Institute of Marine Technology Problems the technological leader in undersea drone technology.
“Anguilliform [eel like] fish consume less energy when on a long distance journey than regular autonomous underwater vehicles,” Xu told Defense One. “They are highly maneuverable and flexible, making them more suitable than Gliders for navigating small spaces… The noiseless propulsion is another advantage” for the military, he says. “They’re less detectable than robot subs that propel themselves the same way as conventional subs.”
originally posted by: lostbook
...or attack underwater divers.