Most people use quadcopters for aerial video. Drones could prove useful underwater as well. Take the Loon Copter for instance. It is a multi-rotor vehicle capable of flying in the air and performing missions underwater. It can also float on the surface of the water with its sensors below the surface.
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Loon Copter: The Air + Surface + Underwater Drone (winner of 2016 Drones for Good Competition)
Since the drone is buoyant, it does not require any energy to float. It has 4 motors to maneuver underwater. The above video shows Loon Copter in action.
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