When the dragon skeleton combat vessel stopped, most of its body sunk. It relied on its sealed metal box for buoyancy. When Saleen saw the skeletal warship being pulled down into the sea, he immediately took control of the dragon skeleton combat vessel. With the grand mage's help, they activated all the magic furnaces and the dragon skeleton combat vessel spread its gigantic skeletal wings and flew into the sky.
The dragon skeleton combat vessel was newly designed, but even so, the energy it used up from flying far surpassed that of Saleen's elemental magic tower.
There were 18 magic furnaces on the dragon skeleton combat vessel, but usually one was enough to steer it around the sea. Eighteen magic furnaces had to be turned on in order for it to fly. Of course, the advantage was that the combat vessel would be able to make use of the skeletal wings to fly all the way to a height of 1,000 yards before stopping.