Flying Shark

Flying sharks: As the name suggests, it is similar to a flying shark. It can be used for water and underwater rescue. Take up to one occupant.
The control system is
AG1: main brake electric motor, slider 1 control feed,
AG2: force engine, used to fly a short distance, throttle control feed.
Surface speed 40M/S, underwater speed 30M/S, upabout 16M/S, dive about 15M/S, dive depth of 2000 m.
Flight skills: Dive at least 50 meters, quickly pull the elevation, make the head about 45 degrees, start the force engine (you can of course activate it early, it will not work underwater and burn fuel, but the water surface does not) and so on it rushes out of the water, control sloping and throttle to achieve the purpose you want..