Cool vid i was thinking i could experiment with bouys pulling the dive planes level once the sub went like 6 in down. then in order to surface i would just let go of the controls. I would have somekind of magnet hooked on the bowplanes which would be connected to a wire strong enough to hold bouys up then once the bouys hit the water they would have bouyancy whcih would pull on the wire pulling the bow planes level i dont know if this is possible though i have to make sure my WTC works after all its just a bottle