Here is another waterproof quadcopter that lets you explore above and below the water without having to use a different device. Tetra Fully Submersible Drones are rated to a depth of 10 meters. They can be used for inspecting boat hulls and other similar projects.
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Tetra Full Transition Testing - Waterproof Quadcopter - Underwater Drone - Submersible
To transition from air to underwater mode, simply change the air propellers with underwater propellers. The above video shows the drone in action.
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