The modern navy is regularly working on updating its equipment, its outreach, its maneuverability. One of the ways in which it accomplishes these goals is through the employment of drones, autonomous machines fulfilling important defensive and militaristic tasks. AUV's, or autonomous underwater vehicles (sometimes alternatively known as unmanned underwater vehicles -- UUV's), comprise one department in which such drone tech is seeing action. According to Marine Insight, such aquatic automatons were being made as early as 1957. They can range in size anywhere from 0.91 meters (approximately 3 feet) to over 10 meters (over 32 feet) long.