U-Boot
Submerge and resurface a submarine
Push the button to dive or surface the submarine. Diving or surfacing of a submarine is facilitated by so-called ballast tanks. During surfacing the tanks are filled with pressurised air which simultaneously drives out water. This reduces the weight of the submarine and it rises to the surface. During diving the valves through which water flows in are opened and the air is pushed out. The weight of the submarine increases and it will dive.
