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Hydro Drone "The Cannonball"

Despite it's looks, this bizarre looking craft if incredibly stable, with an infinite flying and diving range! Drop the hoses into the ocean and you'll be able to fly forever in silence. Batteries are self charging, but will run down if you have all the pumps running.

Can store about 10K liters of water onboard, which is really only about 30-40 seconds of flying time without drawing from a water source, so plan your landings carefully! It will automatically deploy emergency parachutes if it runs out of water over 50 meters.